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Mental Math Addition Strategies
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Mental Math Addition Strategies
Use mental strategies to add. Show or explain your thinking where asked. You may use a different correct strategy from the one suggested.
Break Apart and Add
1.Add 36 + 42 by splitting each number into tens and ones. Write the two splits, add the tens and ones, then give the total.
2.Solve 58 + 26 by making the next ten. How much must you add to 58 to reach 60, and how much of 26 remains? Then find the total.
3.Which expression is a useful way to work out 19 + 20 using a near-double?
- 20 + 20 − 1
- 19 + 19 − 1
- 10 + 20 + 9
- 20 + 10 − 1
4.Calculate 276 + 98 by making a friendly hundred. Show how you adjust the addends.
Choose a Helpful Strategy
5.Work out 67 + 29 using any mental addition strategy. Name your strategy and show enough working to explain it.
6.Work out 35 + 35 using a double. Then write the total.
7.Use the number line to show jumps that add 24 to 46. Label your jumps and write the sum.
8.Match each addition problem to the strategy that is especially convenient. Use each strategy once.
- 49 + 48
- 68 + 25
- 198 + 76
- 32 + 46
- Break apart tens and ones
- Near double
- Make a ten
- Make a hundred
9.Solve 47 + 38. Choose the most useful strategy from the options and calculate the total.
- Make a ten: 47 + 3 + 35
- Use a double: 47 + 47 − 8
- Make a hundred: 47 + 100 − 38
- Break apart: 40 + 30 + 7 + 7
Explain and Practise
10.Explain one mental strategy for adding 76 + 18. Include the steps and the answer.
11.Which strategy fits 58 + 58 best? Choose one and calculate the sum.
- Use a double
- Make a ten
- Make a hundred
- Break apart by changing one addend
12.Calculate 124 + 67 by breaking 67 into tens and ones. Show the partial additions.
13.Mele adds 299 + 56 by calculating 300 + 56, then taking away 1. What total does she get?
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