Dr David Costello
@dr_costello
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Author of #MessingAroundWithMath, #MathematizingStudentThinking, #MakingMathStick and #usingwhatworks. Principal, Speaker, Workshop Facilitator #math
Canada
Joined October 2015
I’m looking for help. In what order do you or your board instruct addition/subtraction fact learning strategies? #NCSM2025 #NCTMATL25
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What's Going On in Math Education? Look no further than @researchEDCan (Sat Oct 25/25) for some outstanding sessions with @amandavande1 (#SpringMath) @johnmighton (#JUMPMath) @dr_costello (#CostelloMath) We're also offering a taste of @rastokke 's podcast (Chalk&Talk) #mathed
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Coming Soon: Better Together - Introducing the Science of Math! We've got Math covered at researchED Atlantic Canada (Oct 25/25). Join Us for Featured Session with @amandavande1 @johnmighton and @dr_costello Great to see #JUMPMath #SpringMath and #CostelloMath together #mathed
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Speaker Spotlight: "Making Math Stick" is the topic PEI Math teacher Dr David Costello @dr_costello will address at researchED Canada #rEDATCan25 on October 25/25 at Saint Mary's University. Register at Eventbrite to reserve your spot. See you in Halifax! #NSed #NBed #PEI #PEIed
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Thank you to @PearsonK12 for the sample copies of #Mathology. I was part of the author team for the Grade 9 Practice Workbook. Nice to look through the teacher and student editions. #math @PembrokePublish @oame_qslma @OAMEcounts
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It was great chatting with you! Looking forward to future conversations!
Great presentation about the science of learning and math by @dr_costello @QueensEduc! Thanks for organizing the event @oame_qslma😊
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In less than one hour I’ll be starting my keynote for @oame_qslma Conference in Kingston, Ontario. We will be exploring the Science of Learning and spiraling curriculum. @oame_qslma @OAMEcounts @PembrokePublish #math #iteachmath
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Check out my newest project! The release for the book will be February 2026! #math #mtbos #iteachmath #mathchat
Have you seen our new catalogue? We've got books to help you teach reading, manage your time, explore student-driven learning, delve into DEI & much, much more — check it out: https://t.co/7YRj9EWIcU
#profdev #catalogue #onlinecatalogue #teaching #learning #education #edutwitter
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Check it out! A math warmup activity that is based on retrieval practice (evidence-based). It only takes 5-8 minutes. Grade 3-8 questions for the school year! Click here https://t.co/xq7HKEDBlO
#elemmathchat #maths #math
costellomath.com
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Don't forget to register for our fall mini conference on September 18th featuring @dr_costello Members check your email for a special draw if you bring a friend who is not a QSLMA member. Registration closes September 14th
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Come one, come all! I’ve been looking forward to sharing this for quite some time. @OAMEwrites #onted @PembrokePublish
Who is joining us? Going to be a great evening.
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Check it out! My last column in @OAMEwrites. Meaning Making In The Classroom: Tips for a Successful September Start-Up!
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I’m looking forward to be facilitating 2 sessions at #PCTM2025 today! We will be exploring mathematical modelling, retrieval practice (Science of Learning) and I will share a resource with over 4000 #math problems. @PCTMpctm @PembrokePublish
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I have just updated Daily Cumulative Review (a great math warmup activity) and I’ll be adding a new Problem of the Week. Click here https://t.co/Sc9a6k62At
#maths #iteachmath #math
costellomath.com
Explore insights on retrieval practice, problem-solving, math literacy, differentiation, curriculum mapping, and year plans.
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I just posted a new Problem of the Week! Prompts for K-3, 4-6 and 7-9. This week’s focus - an open-ended task that focuses on math vocabulary and operations. Click here https://t.co/Sc9a6k62At
#maths #math
costellomath.com
Explore insights on retrieval practice, problem-solving, math literacy, differentiation, curriculum mapping, and year plans.
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What am I doing before watching tonight’s big hockey game? I’m creating Daily Cumulative Review questions for Grades 3-8 and Problem of the Week tasks for Grades K-8. Both will be posted to my website shortly.
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