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TDSB Mathematics and Numeracy Department @tdsbmath.bsky.social · 28/10/2025

Elementary teachers from the West Toronto math cluster explore how to guide students from simple patterning to algebraic thinking. There will be some serious math magic back in the classroom!

Diagram of a tables and chairs problem with trapezoids arranged in rows. A table of values with an expression of 3n + 2 is on a whiteboard.

A growing pattern with red and blue tiles

A growing pattern with blue and red tiles. An expression of 5n+3 is written.

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Tiffany @tleeteach.bsky.social · 23/10/2025

Day 2 of Leadership in Destreamed Mathematics PD and leaders got to play with algebra tiles to explore how they could use them to collect like terms, add/subtract polynomials, multiply and expand, factor and complete the square. So much fun! @mrjasonto.com @tdsbmath.bsky.social

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Codruta Colceriu @codruc.bsky.social · 22/10/2025

How can we count efficiently? Counting Collections to start the Number Sense unit that will focus on representing, composing and decomposing numbers. Grade 3s @tdsb.on.ca Gracedale PS came up with amazing observations! @mrjasonto.com @tdsbmath.bsky.social

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Tiffany @tleeteach.bsky.social · 19/10/2025

Day 1 of facilitating with @codruc.bsky.social on Shaping Algebraic Reasoning with grade 7-10 teachers. Such a great PD on patterning and linear relations. Great activities to bring back to the class and do with students. @mrjasonto.com @tdsbmath.bsky.social

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Tiffany @tleeteach.bsky.social · 19/10/2025

Exploring unit fractions with grade 9s at Emery CI. Lots of math conversations happening! @mrjasonto.com @tdsbmath.bsky.social

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Tiffany @tleeteach.bsky.social · 19/10/2025

Day 1 of Unlocking Fractions with grades 2-5 math teachers was great! Dived into equal sharing, estimating proportions and unit fractions! @tdsbmath.bsky.social @mrjasonto.com

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Tiffany @tleeteach.bsky.social · 19/10/2025

Using mini whiteboards as a tool for a whole class formative assessment is so quick and easy to do. Great strategy! @mrjasonto.com @tdsbmath.bsky.social

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mathiferous-julia.bsky.social @mathiferous-julia.bsky.social · 30/09/2025

Working on algebraic rules with Grade 6’s at Lord Dufferin Great work! @tdsbmath.bsky.social #visualmath #slgebraicthinking

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mathiferous-julia.bsky.social @mathiferous-julia.bsky.social · 29/09/2025

Getting started with Number Talk strategies in Grade 2/3 at Bruce PS @tdsbmath.bsky.social #NumberTalk #visualmath

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Tiffany @tleeteach.bsky.social · 26/09/2025

Day 1 of Leadership in Destreamed Mathematics🤩! Had VP/Ps,CL/ACLs & teachers analyze school data to help set goals.& Looked at formative assessments & talk about next steps through small group instruction. & Worked on linking factor trees to scientific notation! @mrjasonto.com @tdsbmath.bsky.social

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mathiferous-julia.bsky.social @mathiferous-julia.bsky.social · 10/09/2025

Getting started with a Number Talk for Grade 3’s at Rose Ave #NumberTalk #visualmath @tdsbmath.bsky.social

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mathiferous-julia.bsky.social @mathiferous-julia.bsky.social · 09/09/2025

First 20 days of math with the grade 2/3’s in Ms Wells class at Lord Dufferin His many dots?

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Jason To | 杜澤信 @mrjasonto.com · 14/05/2025

Some screen grabs of my OAME presentation, “Let’s Get This Straight: Making Sense of the Explicit vs. Inquiry-based Instruction Discourse and What it Means for your Math Teaching.” The audience created word clouds, shared ideas, answered math questions & sang a little Bon Jovi. All in a day’s work.

A diagram with 3 axes. One is Rachel Lambert’s continuum of instructional practices from less to more support (unassisted discovery, guided inquiry, guided strategic development, strategic coaching, and explicit instruction). A second axis is high fidelity to surface level, and the third is timely to ill-timed.

A diagram on presenting new material in small steps illustrated by thin-sliced tasks

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Tiffany @tleeteach.bsky.social · 15/05/2025

Implementing @tdsbmath.bsky.social “Shaping Algebraic Reasoning” PD with our Math Learning Partner schools & teachers. As we enter our linear relations unit, gr 9 students are building patterns➡️equations➡️graphs. @mrjasonto.com @mervisalo.bsky.social

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Codruta Colceriu @codruc.bsky.social · 09/04/2025

The double number line: quite popular among the @tdsb.on.ca Gr. 3 students. An effective visual tool to help solve multiplication, division and ratio-related #math problems! @mrjasonto.com @tdsbmath.bsky.social @mervisalo.bsky.social

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Jason To | 杜澤信 @mrjasonto.com · 03/04/2025

Teachers dove deeper into how Sk’ad’a principles, paired with @peterliljedahl.bsky.social’s Thinking Classrooms, can improve math achievement for all, but particularly First Nations, Métis, & Inuit children. Always grateful to work in partnership w/ the @tdsb.on.ca Urban Indigenous Education Centre.

Sticky notes with reflections on their work with students that reflects the Sk’ad’a principle of “Learning occurs through contribution.”

Sticky notes with reflections on their work with students that reflects the Sk’ad’a principle of “Learning emerges from strong relationships.”

A visual math solution written on a chalkboard.

A trajectory of Ontario mathematics curriculum expectations for simplifying polynomials from Grade 5 to Grade 8.

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Jason To | 杜澤信 @mrjasonto.com · 03/04/2025

Math extraordinaire @nicorowinsky.bsky.social & I are working w/ educators through a 3-day @tdsbmath.bsky.social series on Rethinking Disability & Mathematics, inspired by @mathematize4all.bsky.social. Ensuring students w/ disabilities achieve grade-level math is key to improve academic outcomes.

Nico launches a math activity for participants.

Jason leading an activity on solving equations using Polypad.

The UDL math framework by Dr. Rachel Lambert.

Teachers work on whiteboards to solve a math problem.

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Codruta Colceriu @codruc.bsky.social · 03/04/2025

Despite today's winter weather, teachers in North York #TDSB had an energy-filled Day 2 of Building Foundational #Math Skills! We analyzed the lasting usefulness of Up & Over 10 & Constant Difference & played games to promote various (+/-) strategies. @tdsbmath.bsky.social @mervisalo.bsky.social

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Tiffany @tleeteach.bsky.social · 01/04/2025

The importance of collecting ongoing data w/ formative assessments. We were keeping our eye out on these students,taught them algebra with algebra tiles and were able to move them forward. Still have more work to do but happy to see these students succeed.🤩 @mrjasonto.com @tdsbmath.bsky.social

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Tiffany @tleeteach.bsky.social · 01/04/2025

Watch this gr9 solve 2x+3=x+1 w/ algebra tiles. Day before we used tiles to add&subtract polynomials. Then a bit of direct instruction for solving eq&off they went! I didn’t even do an example for multi step&they figured it out themselves. @tdsbmath.bsky.social @mrjasonto.com @mervisalo.bsky.social

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Tiffany @tleeteach.bsky.social · 31/03/2025

Thin sliced activity on unit rates and proportion happening here. Being able to see students collaborating and engaged & hearing the math conversations is so great 😍 @mrjasonto.com @mervisalo.bsky.social @tdsbmath.bsky.social

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Tiffany @tleeteach.bsky.social · 31/03/2025

Analyzing gr 9 math student exit tickets & grouping them for targeted math instruction the next day. We were able to move students forward within a few minutes of small group instruction & collect data. @mrjasonto.com @mervisalo.bsky.social @tdsbmath.bsky.social

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Tiffany @tleeteach.bsky.social · 31/03/2025

When the correct answer isn’t 22, but I wouldn’t have known that if I didn’t use the mini whiteboards a a tool for assessment. This helped my partner teacher & I know that this was a question we needed to take up with the class. @mrjasonto.com @mervisalo.bsky.social @tdsbmath.bsky.social

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Tiffany @tleeteach.bsky.social · 31/03/2025

Day 1 of Shaping Algebraic Reasoning allowed teachers to engage and play in the math. We built patterns with tiles and saw how this can help our students see the multiplier&constant, determine equations and make predictions. @mrjasonto.com @mervisalo.bsky.social @tdsbmath.bsky.social

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Codruta Colceriu @codruc.bsky.social · 21/03/2025

#Fractions through Paper folding today in the 4/5 class @Flemington PS. This hands-on activity was engaging and super fun for all students; at the same time: a great assessment opportunity for the teacher! @tdsbmath.bsky.social @mrjasonto.com @mervisalo.bsky.social

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Codruta Colceriu @codruc.bsky.social · 19/03/2025

Every time there’s been an A-ha moment, an understanding of the math concept as a result of work with concrete objects, I thought of Maria #Montessori’s belief from almost 100 years ago: a child’s “hand activities” and “psychological development” are so closely entwined. @tdsbmath.bsky.social

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Michelle Munk @michellemunk.bsky.social · 03/03/2025

Students loved playing the Ghanaian game of Mancala/Oware/Awalé at Carleton Village. It's apparently one of the world's oldest games! Lots of great math conversations! @tdsbmath.bsky.social #Blackhistorymonth2025

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Codruta Colceriu @codruc.bsky.social · 06/03/2025

Great conversations re: the importance of teaching various strategies @ Building Foundational #Math Skills in the Early Years, Day 1. A very special Thank You to @tdsb.on.ca Gosford P.S. staff & students for offering their beautiful library for our learning! @mrjasonto.com @mervisalo.bsky.social

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Toronto District School Board @tdsb.on.ca · 05/03/2025

From celebrating excellence to supporting student success, our March newsletter covers: - Excellence Awards Nominations - Math Achievement Action Plan - Public Policy Consultations - Special Education & Inclusion Drop-in Sessions See what’s new: tdsb.on.ca/enewsletter

A child and an adult are sitting at a table in a classroom, building towers with colourful wooden blocks. The background shows a classroom setting with various educational materials and decorations on the walls.

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Jason To | 杜澤信 @mrjasonto.com · 06/03/2025

Grades 4-10 teachers in @tdsb.on.ca are learning how to effectively develop algebraic thinking (specifically functional thinking) by leveraging growing patterns and the research of Dr. Ruth Beatty and Dr. Cathy Bruce. Patterning and generalizing is the cornerstone to strong algebraic understanding.

PD participant writing a solution to a linear generalizing problem on a whiteboard.

Three OD participants solving a linear generalizing problem on a whiteboard.

A linear growing pattern built using two-coloured tiles.

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Codruta Colceriu @codruc.bsky.social · 09/01/2025

Hi! This is my first #Bsky story with students & teachers who love doing #Math … Today, Gr. 2s @tdsb.on.ca Lamberton PS told me that the triangle 📐 is the polygon with the least number of sides & all polygon names come from Greek! 👏👏 @mrjasonto.com @tdsbmath.bsky.social

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TDSB Mathematics and Numeracy Department @tdsbmath.bsky.social · 08/01/2025

A lot of math happening in the morning routine at George Webster Elementary School 🤩

A whiteboard at the front of a classroom with number words, number bonds, days of the week, and a tally chart of colours.

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Toronto District School Board @tdsb.on.ca · 01/01/2025

Happy New Year! We’re excited to kick off 2025 with something new: our journey on Bluesky! 🎉

Colourful fireworks in the night sky, featuring bursts in various vibrant colours like pink, green, blue, yellow, and orange, with small stars scattered throughout the background.

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Jason To | 杜澤信 @mrjasonto.com · 01/01/2025

Happy New Year! X is getting weirder by the minute, so if you’re part of the TDSB fam (educator, school/team, community member, etc.), check out the pack I put together and let’s connect: go.bsky.app/9JiAnBt Let me know if you or someone else should be added to this ✌🏽

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Jason To | 杜澤信 @mrjasonto.com · 10/12/2024

This is what flow state looks like when teachers learn deeply about fractions 🤩 #EduSky

$A teacher standing in a group and modelling a fraction problem on a whiteboard.$

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Jason To | 杜澤信 @mrjasonto.com · 05/12/2024

Math Learning Partners from @tdsbmath.bsky.social, in partnership w/ @oiseuoft.bsky.social, ran the 4th & final day of our PL series on destreaming Grade 9 math. Teachers experienced geometry & financial literacy expectations, and small-group instruction to push student thinking forward. #EduSky

Handout with activities on circle properties.

An audience of teachers holding up an answer to a math question on mini-whiteboards.

A table with Check Your Understanding questions.

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TDSB Mathematics and Numeracy Department @tdsbmath.bsky.social · 28/11/2024

The core of our team includes 25 amazing Math Learning Partners! They work w/ teachers from 125 schools to build math content knowledge & instructional capacity, support students as they learn, & collaborate to stretch their own math thinking. They bring our math achievement action plan to life.

Math Learning Partners building an algebraic pattern on a table using two-coloured square tiles.

A Math Learning Partners looks over the shoulder of a student and answering a question.

A Math Learning Partner is sitting and analyzing a student’s response to a student seated beside her and answering a visual multiplication problem.

A Math Learning Partner talks to teachers at a professional learning session.

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Jason To | 杜澤信 @mrjasonto.com · 20/11/2024

I tagged along w/ my @tdsbmath.bsky.social teammate Greg Saylor to a Grade 10 class at Thistletown CI who were solving quadratic equations via factoring, quadratic formula, & graphing using thin-sliced tasks. It was so cool to see the connections students were making between these strategies.

Math Learning Partner Greg Saylor explaining today’s activity with students.

Three female students working in front of a whiteboard. One student is writing and using the quadratic formula.

Three male students examining their solution to a quadratic equation on a whiteboard

Greg Saylor is consolidating the learning by speaking to all students that are gathered around him in a huddle.

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Jason To | 杜澤信 @mrjasonto.com · 18/11/2024

Last week, Math Learning Partners from @tdsbmath.bsky.social learned w/ Dr. Alex Lawson & Heather Wark on their research into multiplicative reasoning. Thinking multiplicatively is so crucial for children. Without moving from additive thinking, students are ill-prepared for more complex math ideas.

About 20 educators standing around the edge of a room and listening to someone speak.

Rows of linking cubes on a screen with Alex Lawson presenting

Muffin papers with red and white cubes inside them. Beside them are 2-coloured counters and a bag with more cubes.

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