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Year 3 addition worksheets

Questions

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Year 3 · Addition

Adding 3-digit numbers

1)761 + 405 =
2)163 + 243 =
3)633 + 311 =
4)546 + 532 =
5)472 + 227 =
6)927 + 467 =
7)923 + 357 =
8)338 + 744 =
9)493 + 412 =
10)320 + 837 =
11)343 + 997 =
12)432 + 205 =
13)110 + 347 =
14)247 + 709 =
15)992 + 770 =
16)239 + 918 =
17)853 + 269 =
18)363 + 364 =
19)598 + 530 =
20)426 + 239 =
ticked. · free UK primary worksheetsSheet #00137

Answer key

For marking

Year 3 · Addition · Adding 3-digit numbers

1)761 + 405 = 1166
2)163 + 243 = 406
3)633 + 311 = 944
4)546 + 532 = 1078
5)472 + 227 = 699
6)927 + 467 = 1394
7)923 + 357 = 1280
8)338 + 744 = 1082
9)493 + 412 = 905
10)320 + 837 = 1157
11)343 + 997 = 1340
12)432 + 205 = 637
13)110 + 347 = 457
14)247 + 709 = 956
15)992 + 770 = 1762
16)239 + 918 = 1157
17)853 + 269 = 1122
18)363 + 364 = 727
19)598 + 530 = 1128
20)426 + 239 = 665
ticked. · answersSheet #00137

What Year 3 addition covers

In Year 3, children move on to formal written column addition of numbers with up to three digits. These worksheets give three-digit sums to practise carrying and lining up hundreds, tens and units. Every sheet is A4, print-ready, and comes with an answer key.

Answers included — a separate marking page with every sheet.

Questions parents ask

What addition does Year 3 cover?

Year 3 introduces formal written (columnar) addition of numbers with up to three digits, building on the mental and two-digit work from Year 2. These sheets give three-digit-plus-three-digit sums to practise the written method.

Are the answers included?

Yes. Keep 'Answers' ticked and a separate answer-key page is made with every sheet, so marking takes seconds. Every total is computed exactly and checked.

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