TDSB Mathematics and Numeracy Department
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tdsbmath.bsky.social
TDSB Mathematics and Numeracy Department
@tdsbmath.bsky.social
180 followers 25 following 3 posts
We're the Toronto District School Board Mathematics & Numeracy Department, serving K-12 educators, students, families, and communities across @tdsb.on.ca.
https://sites.google.com/tdsb.on.ca/tdsb-mathematics-for-families
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tdsbmath.bsky.social
TDSB Mathematics and Numeracy Department @tdsbmath.bsky.social · Nov 28
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.
tdsbmath.bsky.social
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 blue tiles. A growing pattern with red and blue tiles A growing pattern with blue and red tiles. An expression of 5n+3 is written.
October 28, 2025 at 11:02 AM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
October 23, 2025 at 10:44 PM
Reposted by TDSB Mathematics and Numeracy Department
codruc.bsky.social
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
October 22, 2025 at 10:29 PM
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tleeteach.bsky.social
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
October 19, 2025 at 7:48 PM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
Exploring unit fractions with grade 9s at Emery CI. Lots of math conversations happening! @mrjasonto.com @tdsbmath.bsky.social
October 19, 2025 at 7:39 PM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
October 19, 2025 at 7:23 PM
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tleeteach.bsky.social
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
October 19, 2025 at 7:19 PM
Reposted by TDSB Mathematics and Numeracy Department
mathiferous-julia.bsky.social
Working on algebraic rules with Grade 6’s at Lord Dufferin
Great work!
@tdsbmath.bsky.social
#visualmath
#slgebraicthinking
September 30, 2025 at 2:22 PM
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mathiferous-julia.bsky.social
Getting started with Number Talk strategies in Grade 2/3 at Bruce PS
@tdsbmath.bsky.social
#NumberTalk
#visualmath
September 29, 2025 at 2:24 PM
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tleeteach.bsky.social
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
September 25, 2025 at 11:19 PM
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mathiferous-julia.bsky.social
Getting started with a Number Talk for Grade 3’s at Rose Ave
#NumberTalk
#visualmath
@tdsbmath.bsky.social
September 10, 2025 at 3:09 PM
Reposted by TDSB Mathematics and Numeracy Department
mathiferous-julia.bsky.social
First 20 days of math with the grade 2/3’s in Ms Wells class at Lord Dufferin
His many dots?
September 9, 2025 at 4:08 PM
Reposted by TDSB Mathematics and Numeracy Department
mrjasonto.com
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.
Jason speaking to a crowd. An audience holding up whiteboards 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
May 14, 2025 at 10:37 AM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
May 15, 2025 at 1:32 PM
Reposted by TDSB Mathematics and Numeracy Department
codruc.bsky.social
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
April 9, 2025 at 1:27 AM
Reposted by TDSB Mathematics and Numeracy Department
mrjasonto.com
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.
April 3, 2025 at 11:24 AM
Reposted by TDSB Mathematics and Numeracy Department
mrjasonto.com
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.
April 3, 2025 at 11:46 AM
Reposted by TDSB Mathematics and Numeracy Department
codruc.bsky.social
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
April 3, 2025 at 3:04 AM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
April 1, 2025 at 2:09 PM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
April 1, 2025 at 1:47 PM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
March 31, 2025 at 2:57 PM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
March 31, 2025 at 2:56 PM
Reposted by TDSB Mathematics and Numeracy Department
tleeteach.bsky.social
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
March 31, 2025 at 2:54 PM
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tleeteach.bsky.social
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
March 31, 2025 at 2:53 PM
Reposted by TDSB Mathematics and Numeracy Department
codruc.bsky.social
#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
March 21, 2025 at 5:42 PM