Math Detectives: Add & Subtract!
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Math Detectives: Add & Subtract!
Grade 2 Problem Solving Adventure Using Mental Math & Manipulatives
Our Detective Mission
Solve addition and subtraction problems within 100 Use objects and drawings to show our thinking Explain our problem-solving strategies Work together as math detectives
Warm-Up: Mental Math Sprint
Look at the problem on the board Solve it in your head Write your answer on your whiteboard Share your thinking strategy
Detective Tools for Problem Solving
Base-10 blocks (tens and ones) Number lines for counting Drawings and pictures Mental math strategies
Story Problem Investigation
Partner Detective Work
Work with your partner Use base-10 blocks for each problem Draw pictures to show your thinking Explain your strategy to your partner
Detective Strategies Discussion
Which strategy helped you solve the problem? How did you use the base-10 blocks? What would you do differently next time?
Different Ways to Solve Problems
{"left":"Using base-10 blocks to show tens and ones\nDrawing pictures and diagrams","right":"Counting on a number line\nMental math strategies like making ten"}
Independent Detective Challenge
Solve this problem on your own: Maya had 47 stickers. She gave 19 to her friend. How many stickers does Maya have now? Choose your favorite strategy Show your work clearly
Great Detective Work Today!
Every detective has their own special way of solving mysteries. What was your favorite strategy today?