Addition and subtraction · Ages 6–7

Adding three numbers worksheet

Part of: Two-digit addition and subtraction

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Addition and subtraction · Ages 6–7

Numsprite
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Name:Date:Score:／48

Write each answer in the space. For word problems, show your working and write a sentence answer.

13.Chi-keung has 6 red beads, 7 blue beads and 4 yellow beads. How many beads does Chi-keung have?
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Answer:
14.Ka-lok reads 10 pages on Monday, 16 on Tuesday and 23 on Wednesday. How many pages is that in the three days?
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Answer:
15.An empty bus picks up 12 people at the first stop, 5 at the second and 10 at the third, and nobody gets off. How many people are on the bus?
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16.Ka-lok buys a $24 pen, a $36 notebook and a $6 eraser. How much is that altogether?
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17.Ka-yee reads 11 pages on Monday, 26 on Tuesday and 30 on Wednesday. How many pages is that in the three days?
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Answer:
18.An empty bus picks up 19 people at the first stop, 18 at the second and 18 at the third, and nobody gets off. How many people are on the bus?
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Answer:

Show the answers and working

Adding three numbers worksheet: Answers and working

1. 18
Look for the two numbers that make 10 and add those first.
9 and 1 make 10: add them first, then 8: 10 + 8 = 18.
2. 18
See whether two of them make 10. If not, go left to right: start with 8 + 3.
Left to right: 8 + 3 = 11, 11 + 7 = 18.
3. 20
See whether two of them make 10. If not, go left to right: start with 3 + 8.
Left to right: 3 + 8 = 11, 11 + 9 = 20.
4. 13
Look for the two numbers that make 10 and add those first.
2 and 8 make 10: add them first, then 3: 10 + 3 = 13.
5. 1, 10, 11
You can change the order. Put 8 and 2 together: what do they make?
Change the order so 8 and 2 are together: 8 + 2 = 10, 10 + 1 = 11.
6. 86
The ones of 39 and 11 make 10, so add those two first to get a whole ten.
39 + 11 = 50, a whole ten; then add 36: 86.
7. 6, 10, 16
You can change the order. Put 3 and 7 together: what do they make?
Change the order so 3 and 7 are together: 3 + 7 = 10, 10 + 6 = 16.
8. 73
The ones of 33 and 17 make 10, so add those two first to get a whole ten.
33 + 17 = 50, a whole ten; then add 23: 73.

9. B. 7 and 3
When adding three numbers you can change the order. Which two make exactly 10?
7 and 3 make 10: adding them first is easiest.
10. B. 2 and 8
When adding three numbers you can change the order. Which two make exactly 10?
2 and 8 make 10: adding them first is easiest.
11. True
Look for two that make 10, work out the total, then compare it with 10.
2 + 3 + 5 = 10: find two that make 10 first, or go left to right.
12. True
Look for two that make 10, work out the total, then compare it with 24.
6 + 9 + 9 = 24: find two that make 10 first, or go left to right.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 17 beads
Add all three. See whether two make 10 first; if not, go left to right.
Add the three: 6 + 7 + 4 = 17.
14. 49 pages
Add the three days. Start with Monday and Tuesday: 10 + 16.
Add the three days: 10 + 16 + 23 = 49.
15. 27 people
Everyone getting on adds up. Start with the first two stops: 12 + 5.
Everyone getting on adds up: 12 + 5 + 10 = 27.
16. 66 dollars
See which two prices have ones that make 10. Add 24 and 6 first to get a whole ten.
Add the pair that makes a whole ten first: 24 + 6 = 30; then 36: $66.
17. 67 pages
Add the three days. Start with Monday and Tuesday: 11 + 26.
Add the three days: 11 + 26 + 30 = 67.
18. 55 people
Everyone getting on adds up. Start with the first two stops: 19 + 18.
Everyone getting on adds up: 19 + 18 + 18 = 55.

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