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Maths · Grade 1 · Set C
Add three groups, one more step
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C
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Goal: 15 min
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Remember: Find two numbers that make ten, or a double, and add them first. The order does not change the total.

Add three groups

Look for two numbers that make ten, or a double. Add them first.

1
Find two groups that make ten. How many stars in all?
2
7 + 6 + 3 =
3
15 beads in all. How many blue beads?
4
Use a double. 6 + 6 + 3 =
5
Mia has 5 pears, 6 peaches and 5 grapes. How many fruits does Mia have?
6
You can add 8 + 7 + 2 by adding 8 + 2 first.
TrueFalse

Think about it

7
Which total is the biggest?
6 + 4 + 59 + 9 + 17 + 3 + 8
8
Put the sums in order. Smallest total first.
  • 5 + 4 + 6
  • 9 + 5 + 5
  • 3 + 3 + 3
9
= 9 + 4 + 4
10
Circle every sum that equals 15.
5 + 5 + 58 + 2 + 49 + 1 + 56 + 4 + 6
11
Show two ways to add 6 + 5 + 4. Which is easier?
12
Draw 3 groups to show 5 + 5 + 7.
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Answer key · Set C
Add three groups, one more step
116 8 and 2 make 10. Then 10 and 6 more is 16.
216 7 and 3 make 10. Then 10 and 6 more is 16.
35 4 and 6 make 10. 15 take away 10 is 5.
415 6 and 6 make 12. Then 12 and 3 is 15.
516 5 and 5 make 10. Then 10 and 6 is 16.
6True 8 and 2 make 10. Then 10 and 7 is 17.
79 + 9 + 1 6 + 4 + 5 is 15. 9 + 9 + 1 is 19. 7 + 3 + 8 is 18.
82, 3, 1 3 + 3 + 3 is 9, 5 + 4 + 6 is 15 and 9 + 5 + 5 is 19.
917 4 and 4 make 8. Then 9 and 8 is 17.
105 + 5 + 5, 9 + 1 + 5 5 + 5 + 5 and 9 + 1 + 5 are 15. 8 + 2 + 4 is 14 and 6 + 4 + 6 is 16.
11Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.