Y4 Addition and Subtraction - MathSphere

1 MATHEMATICS Y4 Addition and Subtraction 4260 Use known number facts and place value to add or subtract Equipment Paper, pencil, ruler number cards Stop clock MathSphere MathSphere 4260 Use known number facts and place value to add or subtract Page 2 MathSphere 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 365 + 8 = b.

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

3 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 Page 3 MathSphere Adding a single digit 1. 437 + 4 = 2. 528 + 3 = 3. 735 + 6 = 4. 243 + 9 = 5. 348 + 5 = 6. 139 + 2 = 7. 685 + 7 = 8. 816 + 8 = 9. 183 + 9 = 10. 242 + 9 = 11. 168 + 4 = 12. 534 + 7 = 13. 357 + 5 = 14. 712 + 8 = 15. 6 + 317 = 16.

4 5 + 326 = 17. 9 + 349 = 18. 8 + 487 = 19. 3 + 199 = 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. 538 + 6 = I added two to make 40 then counted on four more to make 544 21. 279 + 5 = Explain: 22. 538 + 8 = Explain: 23. 175 + 6 = Explain: 24. 429 + 8 = Explain: 25. 377 + 6 = Explain: Write the answers down to the sums below as quickly as you can - do not do any working out on paper. 4260 Use known number facts and place value to add or subtract Page 4 MathSphere Adding a single digit 1.

5 527 + 5 = 2. 617 + 4 = 3. 146 + 6 = 4. 162 + 9 = 5. 218 + 5 = 6. 149 + 2 = 7. 383 + 7 = 8. 619 + 8 = 9. 276 + 9 = 10. 151 + 9 = 11. 248 + 4 = 12. 814 + 7 = 13. 735 + 5 = 14. 807 + 8 = 15. 6 + 184 = 16. 5 + 227 = 17. 9 + 666 = 18. 8 + 777 = 19. 3 + 888 = 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. 187 + 6 = I added three to make 190 then counted on three more to 193 21. 178 + 5 = Explain: 22. 388 + 9 = Explain: 23. 717 + 6 = Explain: 24.

6 545 + 8 = Explain: 25. 808 + 6 = Explain: In your head, as fast as you can, answers only! Go! Go! Go! 4260 Use known number facts and place value to add or subtract Page 5 MathSphere 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.

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 + = 271 Explain: 12. 725 + = 733 Explain: 13. + 5 = 611 Explain: 14. + 8 = 540 Explain: 15. 533 + 8 = Explain: I counted on 7 up to 270 and then added one more making plus 8. 4260 Use known number facts and place value to add or subtract Page 6 MathSphere Complete these questions by putting the correct number in the boxes.

8 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 + = 381 Explain: 12. 816 + = 824 Explain: 13.

9 + 6 = 722 Explain: 14. + 8 = 651 Explain: 15. 642 + 9 = Explain: I counted on 8 up to 380 and then added one more making 9. 4260 Use known number facts and place value to add or subtract Page 7 MathSphere 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.

10 500 - 6 = 6. 800 - 9 = 7. 600 - 3 = 8. 100 - 7 = 9. 700 - = 692 Explain: 10. 200 - = 194 11. - 8 = 292 12. - 6 = 694 On the next set of questions write down how you did the sum in your head. 4260 Use known number facts and place value to add or subtract Page 8 MathSphere subtracting single digits from whole hundreds Complete these questions by putting the correct number in the boxes.