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Addition to 20 Strategies
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Name:Date:
Addition to 20 Strategies
Use make 10, doubles, or counting on to work out each sum. Show or explain your thinking where asked.
Pick a strategy
1.Work out 8 + 6. Show how you used make 10.
2.Work out 9 + 7. Write or draw the steps you used.
3.Which strategy is a good match for 6 + 6?
- Make 10
- Doubles
- Counting on
4.Complete the sum that uses doubles: 6 + 6 = .
5.Work out 15 + 3 and name a strategy that could help.
6.Work out 5 + 5 and name a strategy that could help.
7.Work out 11 + 6 and name a strategy that could help.
8.Work out 7 + 8 and name a strategy that could help.
9.Work out 10 + 8 and name a strategy that could help.
10.Work out 4 + 9 and name a strategy that could help.
11.Use make 10 to work out 13 + 7. Show the steps.
Explain and check
12.Finn works out 8 + 9 by moving 1 from 8 to 9. Explain how this makes the addition easier.
13.True or false? 13 + 5 = 18. Give a reason for your answer.
TrueFalse
Find the missing number
14.Fill the gap: + 7 = 20.
15.Fill the gap: 16 + = 20.
16.Fill the gap: + 6 = 14.
17.Fill the gap: 8 + = 17.
18.Write one addition sentence with a missing number that equals 15. Fill in the answer too.
4 printable pages
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