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Maths · Grade 1 · Set A
Three at once
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A
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Goal: 15 min
Score/ 13
Remember: Find two numbers that make ten and add them first. The order does not change the total.

Add three groups

Look for two numbers that make ten. Add them first.

1
Add all three groups. How many apples are there in all?
2
Which two groups make ten?
the 2 and the 8the 8 and the 3the 2 and the 3
3
How many stars in all? Find two groups that make ten first.
4
1 + 8 + 2 = 10 +
5
Count the three groups of balloons. How many are there in all?
6
3 + 7 + 4 = 14.
TrueFalse
7
8 + 5 + 2 and 2 + 8 + 5 make different totals.
TrueFalse
8
Mia picks 7 red apples, 3 green apples and 6 yellow apples. How many apples does Mia pick?
9
6 + 8 + 2 = 10 +
10
Which two numbers do you add first in 4 + 6 + 3?
6 and 34 and 34 and 6
11
Join each sum to its total.
  1. 12 + 8 + 3
  2. 24 + 6 + 5
  3. 39 + 1 + 2
  • A13
  • B12
  • C15
12
= 3 + 5 + 7
13
Sam has 3 red cars, 3 blue cars and 5 green cars. How many cars does Sam have?
14
Write three numbers that add up to 10. Show how you know.
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Answer key · Set A
Three at once
113 5 and 5 make 10. Then 10 and 3 more is 13.
2the 2 and the 8 2 and 8 make 10. Add those first.
314 3 and 7 make 10. Then 10 and 4 more is 14.
41 8 and 2 make 10. So 1 + 8 + 2 is 10 and 1 more.
515 9 and 1 make 10. Then 10 and 5 more is 15.
6True 3 and 7 make 10. Then 10 and 4 is 14.
7False Order does not matter. Both bars are the same length: 15.
816 7 and 3 make 10. Then 10 and 6 is 16.
96 8 and 2 make 10, so the other number is 6.
104 and 6 4 and 6 make ten, and ten is an easy number to add to.
111-A, 2-C, 3-B
1215 3 and 7 make 10. Then 10 and 5 is 15.
1311 3 and 3 make 6. Then 6 and 5 is 11.
14Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.