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Mental Addition Strategies
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Mental Addition Strategies
📚 Part 1: Multiple Choice (Choose the best strategy)
1. Which mental strategy is quickest for 47 + 36?
Make tens (bridge to 50) and then add
Add vertically with carrying on paper
Use doubles
Count on fingers
2. 38 + 39 — which strategy is most efficient?
Double 38, then add 1 (near double)
Make tens from 39
Partition both numbers and add all parts
Use a number line to count up
3. To add 56 + 27 quickly, which step helps make a ten first?
Add 4 to 56 (making 60), then add 23
Add 3 to 56, then add 24
Double 56 then subtract
Add 27 to 50, then add 6
4. Check all that apply: Which problems are good for using doubles or near doubles?
47 + 62
74 + 76
33 + 33
58 + 59
✏️ Part 2: Short Answers and Working
5. Solve 47 + 36 using the "make tens" strategy. Show your mental steps.
6. Solve 38 + 39 using doubles or near doubles. Describe the quick trick you used.
7. You and a friend found shells: 27 and 46. Add mentally and show how you made the calculation faster.
8. Market maths: You buy fruit for $19 and cheese for $27. Add mentally and write the steps you used (hint: make a ten).
🔎 Part 3: Reflection & Exit Slip
9. Write one mental strategy you used today and explain in one sentence how it helped you.
10. Confidence and intention: Rate your confidence using this strategy (1 = not confident, 5 = very confident). Then write one short intention for the next lesson (e.g., "I will try to make tens more often").
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