Addition and subtraction · Ages 7–8

Adding three numbers in a chain worksheet

Part of: Three-digit addition and subtraction

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Addition and subtraction · Ages 7–8

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.

1.50 + 20 + 20 =
Answer:
2.38 + 51 + 40 =
Answer:
3.40 + 40 + 20 =
Answer:
4.Work out 210 + 261 + 113: first 210 + 261 = , then add 113 to get .
Fill in each blank
Answer:
5.361 + 22 + 304 =
Answer:
6.Work out 225 + 130 + 168: first 225 + 130 = , then add 168 to get .
Fill in each blank
Answer:
7.491 + 18 + 312 =
Answer:
8.Use columns: 388 + 266 + 237 =
Answer:
9.399 + + 163 = 812
Answer:
10.273 + + 97 = 435
Answer:

13.May buys a $331 rucksack, a $160 pair of trainers and a $62 storybook. How much is that in all?
Working:
Answer:
14.May folded 137 paper cranes on Monday, 122 on Tuesday and 129 on Wednesday. How many is that in all?
Working:
Answer:
15.A park has 121 people in the morning. 167 more arrive at noon and another 83 in the afternoon, and nobody leaves. How many are in the park in the afternoon?
Working:
Answer:
16.A park has 249 people in the morning. 194 more arrive at noon and another 105 in the afternoon, and nobody leaves. How many are in the park in the afternoon?
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Answer:
17.Ka-yan buys a $196 rucksack, a $298 pair of trainers and a $39 storybook. How much is that in all?
Working:
Answer:
18.Ming folded 66 paper cranes on Monday, 119 on Tuesday and 77 on Wednesday. How many is that in all?
Working:
Answer:

Show the answers and working

Adding three numbers in a chain worksheet: Answers and working

1. 90
All three are whole tens: think of 5 tens, 2 tens and 2 tens added together.
Whole tens, left to right: 50 + 20 = 70, 70 + 20 = 90, so the answer is 90.
2. 129
Add from left to right. Start with 38 + 51.
Left to right: 38 + 51 = 89, 89 + 40 = 129.
3. 100
All three are whole tens: think of 4 tens, 4 tens and 2 tens added together.
Whole tens, left to right: 40 + 40 = 80, 80 + 20 = 100, so the answer is 100.
4. 471, 584
Do 210 + 261 first: hundreds with hundreds, tens with tens, ones with ones.
210 + 261 = 471; 471 + 113 = 584.
5. 687
Add from left to right: 361 + 22 first, then add 304.
Left to right: 361 + 22 = 383, 383 + 304 = 687.
6. 355, 523
Do 225 + 130 first: hundreds with hundreds, tens with tens, ones with ones.
225 + 130 = 355; 355 + 168 = 523.
7. 821
Add from left to right: 491 + 18 first, then add 312.
Left to right: 491 + 18 = 509, 509 + 312 = 821.
8. 891
Write the three numbers in column form, ones lined up. Add the three ones digits first and carry if it reaches 10.
The ones make 21: write 1, carry 2; the tens carry too: the answer is 891.
9. 250
Add the two you know, 399 and 163, first, then see how much more is needed to reach 812.
399 and 163 make 562, and 812 − 562 = 250.
10. 65
Add the two you know, 273 and 97, first, then see how much more is needed to reach 435.
273 and 97 make 370, and 435 − 370 = 65.

11. True
Add it yourself from left to right, minding any carrying, then compare with 732.
Step by step: 343 + 142 + 247 = 732. Remember to carry.
12. True
Add it yourself from left to right, minding any carrying, then compare with 292.
Step by step: 119 + 143 + 30 = 292. Remember to carry.

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

13. 553 dollars
Add up the three prices. Go left to right, starting with 331 + 160.
331 + 160 + 62 = 553.
14. 388 cranes
Add up the three days. Go left to right, starting with 137 + 122.
137 + 122 + 129 = 388.
15. 371 people
People keep arriving and nobody leaves, so add all three. Start with 121 + 167.
121 + 167 + 83 = 371.
16. 548 people
People keep arriving and nobody leaves, so add all three. Start with 249 + 194.
249 + 194 + 105 = 548.
17. 533 dollars
Add up the three prices. Go left to right, starting with 196 + 298.
196 + 298 + 39 = 533.
18. 262 cranes
Add up the three days. Go left to right, starting with 66 + 119.
66 + 119 + 77 = 262.

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