Addition and subtraction · Ages 7–8

Adding and subtracting together worksheet

Part of: Three-digit addition and subtraction

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Addition and subtraction · Ages 7–8

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

1.50 + 41 − 40 =
Answer:
2.50 − 23 + 23 =
Answer:
3.45 − 16 + 19 =
Answer:
4.56 + 13 − 52 =
Answer:
5.Work out 412 + 126 − 120: first 412 + 126 = , then subtract 120 to get .
Fill in each blank
Answer:
6.305 − 249 + 219 =
Answer:
7.835 − 128 + 167 =
Answer:
8.Work out 254 + 361 − 225: first 254 + 361 = , then subtract 225 to get .
Fill in each blank
Answer:
9.371 + − 61 = 584
Answer:
10.304 + − 130 = 412
Answer:

13.A bookshop has 307 storybooks. It sells 157 in the morning and 310 more are delivered in the afternoon. How many storybooks does it have now?
Working:
Answer:
14.Ka-yan has 343 stickers. May has 50 more than Ka-yan, and Tsz-ching has 71 fewer than May. How many stickers does Tsz-ching have?
Working:
Answer:
15.A T-shirt costs $54, and a pair of trousers costs $60 more than the T-shirt. Ka-yee pays $300 for a pair of trousers. How much change should Ka-yee get?
Working:
Answer:
16.A bus has 30 passengers. At a stop 8 get off and 19 get on. How many passengers are on the bus now?
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Answer:
17.Tsz-ching's money box holds $339. Tsz-ching takes out $38 for stationery, then gets $182 in lucky money and puts it all in. How much is in the box now?
Working:
Answer:
18.A T-shirt costs $178, and a pair of trousers costs $10 more than the T-shirt. Ming pays $500 for a pair of trousers. How much change should Ming get?
Working:
Answer:

Show the answers and working

Adding and subtracting together worksheet: Answers and working

1. 51
With both + and −, go left to right. Start with 50 + 41.
Left to right: 50 + 41 = 91, 91 − 40 = 51.
2. 50
With both + and −, go left to right. Start with 50 − 23.
Left to right: 50 − 23 = 27, 27 + 23 = 50.
3. 48
With both + and −, go left to right. Start with 45 − 16.
Left to right: 45 − 16 = 29, 29 + 19 = 48.
4. 17
With both + and −, go left to right. Start with 56 + 13.
Left to right: 56 + 13 = 69, 69 − 52 = 17.
5. 538, 418
Do 412 + 126 first: hundreds, tens and ones, carrying whenever a place reaches 10.
412 + 126 = 538; 538 − 120 = 418.
6. 275
With both + and −, go left to right: 305 − 249 first, then add 219.
Left to right: 305 − 249 = 56, 56 + 219 = 275.
7. 874
With both + and −, go left to right: 835 − 128 first, then add 167.
Left to right: 835 − 128 = 707, 707 + 167 = 874.
8. 615, 390
Do 254 + 361 first: hundreds, tens and ones, carrying whenever a place reaches 10.
254 + 361 = 615; 615 − 225 = 390.
9. 274
Work backwards: what was it before 61 was subtracted? Start with 584 + 61.
Work backwards: before subtracting 61 it was 584 + 61 = 645, and 645 − 371 = 274.
10. 238
Work backwards: what was it before 130 was subtracted? Start with 412 + 130.
Work backwards: before subtracting 130 it was 412 + 130 = 542, and 542 − 304 = 238.

11. False
Subtracting 163 and adding back 22: how much less is it in all? Check whether that is 185.
Subtracting 163 and adding back 22 subtracts only 163 − 22 in all; left to right, the answer is 120.
12. False
Subtracting 136 and adding back 20: how much less is it in all? Check whether that is 156.
Subtracting 136 and adding back 20 subtracts only 136 − 20 in all; left to right, the answer is 381.

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

13. 460 storybooks
Selling subtracts and deliveries add. Go left to right, starting with 307 − 157.
307 − 157 + 310 = 460.
14. 322 stickers
First work out May's stickers: 50 more than Ka-yan's 343.
Then Tsz-ching's: 71 fewer than May's.
May has 343 + 50 = 393; Tsz-ching has 393 − 71 = 322.
15. 186 dollars
First work out the price of the trousers: $60 more than the $54 T-shirt.
The change is the $300 paid subtract the price of the trousers.
The trousers are 54 + 60 = 114; change 300 − 114 = 186.
16. 41 passengers
Getting off: subtract. Getting on: add. Go left to right, starting with 30 − 8.
Left to right: 30 − 8 + 19 = 41.
17. 483 dollars
Taking money out subtracts and putting it in adds. Go left to right, starting with 339 − 38.
339 − 38 + 182 = 483.
18. 312 dollars
First work out the price of the trousers: $10 more than the $178 T-shirt.
The change is the $500 paid subtract the price of the trousers.
The trousers are 178 + 10 = 188; change 500 − 188 = 312.

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