Adding & Subtracting to 100!
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Adding & Subtracting to 100!
Grade 2 Mathematics Let's explore addition and subtraction with numbers up to 100!
What We'll Learn Today
Use objects and drawings to solve math problems Add and subtract numbers up to 100 Share our thinking with classmates Solve real-world story problems
Mental Math Warm-up
Let's solve some quick problems in our heads! 23 + 7 = ? 45 - 6 = ? Show your answer on your whiteboard!
Our Problem-Solving Tools
Base-10 blocks (tens and ones) Number lines for counting Drawings and pictures Our amazing brains for mental math!
Story Problem Example
Addition vs. Subtraction
{"left":"Addition means combining or putting together\nWe use + sign\nThe answer gets bigger\nExample: 34 + 28 = 62","right":"Subtraction means taking away\nWe use - sign\nThe answer gets smaller\nExample: 67 - 29 = 38"}
Partner Problem Solving
Work with your partner Use base-10 blocks or drawings Solve the story problems on your sheet Explain your thinking to each other
Reflection Time
What was your favorite strategy today? Which tool helped you the most? What made a problem easy or challenging? How did working with a partner help you learn?