PDF Y4 Addition and Subtraction - MathSphere Maths Worksheets

[Pages:18]MATHEMATICS

Y4 Addition and Subtraction

4260 Use known number facts and place value

to add or subtract

Paper, pencil, ruler Number cards Stop clock

Equipment

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4260 Use known number facts and place value to add or subtract

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Page 2

Concepts

In year 4 children are expected to be able to calculate mentally using a variety of methods. They are also expected to explain their methods, both orally and in writing.

The main skills involved are:

a. adding a single digit to a three or four digit number, crossing the tens boundary e.g. 365 + 8 =

b. subtracting a single digit from a three or four digit number, crossing the tens boundary

e.g. 363 - 7 =

c. subtracting a single digit from a whole 100 or 1 000

e.g. 1 000 - 7 =

d. find the difference between two numbers which are close to a whole thousand, but either side of it

e.g. 3 005 - 2 998 =

e. find what needs to be added to a whole hundreds number to make it up to the next thousand

e.g. 4 500 +

= 5 000

f. add or subtract any pair of two digit numbers e.g. 36 + 46 = or 87 - 27 =

All methods used must be explained by the child, in words and writing.

4260 Use known number facts and place value to add or subtract

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Adding a single digit

Page 3

Write the answers down to the sums below as quickly as you can - do not do any working out on paper.

1. 437 + 4 = 5. 348 + 5 = 9. 183 + 9 = 13. 357 + 5 = 17. 9 + 349 =

2. 528 + 3 = 6. 139 + 2 = 10. 242 + 9 = 14. 712 + 8 = 18. 8 + 487 =

3. 735 + 6 = 7. 685 + 7 = 11. 168 + 4 = 15. 6 + 317 = 19. 3 + 199 =

4. 243 + 9 = 8. 816 + 8 = 12. 534 + 7 = 16. 5 + 326 = 20. 4 + 297 =

Work out mentally the answers to the next set of sums. Next to each one write down the method you used to do it.

e.g. 538 + 6 =

21. 279 + 5 = 22. 538 + 8 = 23. 175 + 6 = 24. 429 + 8 = 25. 377 + 6 =

I added two to make 40 then counted on four more to make 544 Explain:

Explain:

Explain:

Explain:

Explain:

4260 Use known number facts and place value to add or subtract

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Adding a single digit

In your head, as fast as you can, answers only! Go! Go! Go!

Page 4

1. 527 + 5 = 5. 218 + 5 = 9. 276 + 9 = 13. 735 + 5 = 17. 9 + 666 =

2. 617 + 4 = 6. 149 + 2 = 10. 151 + 9 = 14. 807 + 8 = 18. 8 + 777 =

3. 146 + 6 = 7. 383 + 7 = 11. 248 + 4 = 15. 6 + 184 = 19. 3 + 888 =

4. 162 + 9 = 8. 619 + 8 = 12. 814 + 7 = 16. 5 + 227 = 20. 4 + 789 =

Work out mentally the answers to the next set of sums. Next to each one write down the method you used to do it.

e.g. 187 + 6 = 21. 178 + 5 = 22. 388 + 9 = 23. 717 + 6 = 24. 545 + 8 = 25. 808 + 6 =

I added three to make 190 then counted on three more to 193 Explain: Explain: Explain: Explain: Explain:

4260 Use known number facts and place value to add or subtract

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Page 5

Complete these questions by putting the correct number in the boxes.

1. 417 + 7 =

2. 537 + 6 =

3. 183 +

= 190

4. 584 +

= 593

5.

+ 6 = 344

6.

+ 4 = 172

7. 8 +

= 460

8. 5 +

= 212

9. 329 + 6 =

10. 588 + 4 =

Work out the next five answers. Write down how you did them.

11. 263 + 12. 725 +

Explain: = 271

Explain: = 733

I counted on 7 up to 270 and then added one more making plus 8.

Explain:

13.

+ 5 = 611

Explain:

14.

+ 8 = 540

15. 533 + 8 =

Explain:

4260 Use known number facts and place value to add or subtract

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Page 6

Complete these questions by putting the correct number in the boxes.

1. 328 + 6 =

2. 646 + 5 =

3. 292 +

= 301

4. 693 +

= 702

5.

+ 3 = 441

6.

+ 5 = 263

7. 9 +

= 370

8. 6 +

= 321

9. 413 + 9 =

10. 698 + 4 =

Work out the next five answers. Write down how you did them.

11. 372 + 12. 816 +

Explain: = 381

Explain: = 824

I counted on 8 up to 380 and then added one more making 9.

Explain:

13.

+ 6 = 722

Explain:

14.

+ 8 = 651

15. 642 + 9 =

Explain:

4260 Use known number facts and place value to add or subtract

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Page 7

Subtracting single digits from whole hundreds

Complete these questions by putting the correct number in the boxes.

1. 200 - 7 =

2. 300 - 4 =

3. 700 - 5 =

4. 400 - 8 =

5. 500 - 6 =

6. 800 - 9 =

7. 600 - 3 =

8. 100 - 7 =

On the next set of questions write down how you did the sum in your head.

9. 700 10. 200 11. 12.

Explain: = 692

= 194

- 8 = 292

- 6 = 694

4260 Use known number facts and place value to add or subtract

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Page 8

Subtracting single digits from whole hundreds

Complete these questions by putting the correct number in the boxes.

1. 300 - 8 =

2. 400 - 5 =

3. 800 - 6 =

4. 200 - 9 =

5. 600 - 4 =

6. 300 - 2 =

7. 500 - 1 =

8. 900 - 7 =

On the next set of questions write down how you did the sum in your head.

9. 800 -

= 793

Explain:

10. 300 -

= 295

11.

- 7 = 193

12.

- 8 = 792

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