Multiplying, dividing and mixed operations · Ages 8–9

Adding and subtracting three numbers worksheet

Part of: Order of operations and brackets

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Multiplying, dividing and mixed operations · Ages 8–9

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.A library has 6207 books. Last week 661 were borrowed and 346 were returned. How many books are in the library now?
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14.A shopping centre has 4703 people in the morning. At noon 687 leave and 178 more arrive. How many people are there now?
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15.A cycle track is 7333 m long. Last week 1022 m were laid and this week another 842 m. How many metres are still to be laid?
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16.Tsz-ching's brother has $2,166. He spends $1,149 on a bike and $685 on a helmet. How much does he have left?
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17.A cycle track is 2024 m long. Last week 1457 m were laid and this week another 519 m. How many metres are still to be laid?
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18.A shopping centre has 2536 people in the morning. At noon 242 leave and 969 more arrive. How many people are there now?
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Show the answers and working

Adding and subtracting three numbers worksheet: Answers and working

1. 620
With no brackets, go left to right one step at a time: 619 + 776 first.
Left to right: 619 + 776 = 1395, 1395 − 775 = 620.
2. 1495
Left to right: work out 900 − 311 first, then add 906.
Left to right: 900 − 311 = 589, 589 + 906 = 1495.
3. 1166
Left to right: work out 656 − 480 first, then add 990.
Left to right: 656 − 480 = 176, 176 + 990 = 1166.
4. 1090
With no brackets, go left to right one step at a time: 690 + 853 first.
Left to right: 690 + 853 = 1543, 1543 − 453 = 1090.
5. 1823, 1125
The first box is 1043 + 780; the second takes 698 away from that.
First 1043 + 780 = 1823, then 1823 − 698 = 1125.
6. 3007
Left to right: work out 4291 − 746 first, then subtract 538.
4291 − 746 = 3545, 3545 − 538 = 3007.
7. 5829, 5443
The first box is 4872 + 957; the second takes 386 away from that.
First 4872 + 957 = 5829, then 5829 − 386 = 5443.
8. 8000
Look at 116 and 884: do they add up to a whole hundred or thousand? Then you can take them off in one go.
116 and 884 make 1000, so take it away at once: 9000 − 1000 = 8000.

9. A. 3087
Left to right: subtract 441, then subtract 250. Both have to come off.
Left to right: 3778 − 441 = 3337, 3337 − 250 = 3087.
10. True
Work it out yourself left to right: 518 + 127, then subtract 180, and compare with 465.
518 + 127 − 180 = 465: watch the carrying and borrowing in each step.
11. C. 5609
Left to right: subtract 556, then subtract 411. Both have to come off.
Left to right: 6576 − 556 = 6020, 6020 − 411 = 5609.
12. True
Work it out yourself left to right: 154 + 405, then subtract 415, and compare with 144.
154 + 405 − 415 = 144: watch the carrying and borrowing in each step.

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

13. 5892 books
Borrowed books come off and returned ones go back. Start from 6207 and go one step at a time.
Borrowed comes off, returned goes back: 6207 − 661 + 346 = 5892.
14. 4194 people
Leaving subtracts and arriving adds. Start from the 4703 in the morning and go one step at a time.
4703 − 687 + 178 = 4194.
15. 5469 m
Both stretches already laid come off the full 7333 m.
7333 − 1022 − 842 = 5469.
16. 332 dollars
Both are spending, so start from $2,166 and subtract twice.
Subtract twice: 2166 − 1149 − 685 = 332.
17. 48 m
Both stretches already laid come off the full 2024 m.
2024 − 1457 − 519 = 48.
18. 3263 people
Leaving subtracts and arriving adds. Start from the 2536 in the morning and go one step at a time.
2536 − 242 + 969 = 3263.

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