← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 219 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.446 + 78 =
  2. 2.446 + 88 =
  3. 3.155 + 39 =
  4. 4.135 + 39 =
  5. 5.121 + 59 =
  6. 6.103 + 89 =
  7. 7.415 + 58 =
  8. 8.212 + 28 =
  9. 9.225 + 67 =
  10. 10.118 + 57 =
  11. 11.237 + 98 =
  12. 12.423 + 58 =
  13. 13.202 + 27 =
  14. 14.315 + 38 =
  15. 15.444 + 89 =
  16. 16.457 + 89 =
  17. 17.396 + 37 =
  18. 18.343 + 78 =
  19. 19.460 + 79 =
  20. 20.251 + 97 =
  21. 21.132 + 18 =
  22. 22.351 + 69 =
  23. 23.102 + 78 =
  24. 24.377 + 98 =
  25. 25.273 + 17 =
  26. 26.37 + 47 =
  27. 27.438 + 19 =
  28. 28.424 + 29 =
  29. 29.451 + 97 =
  30. 30.293 + 58 =
  31. 31.41 + 58 =
  32. 32.411 + 58 =
  33. 33.122 + 98 =
  34. 34.51 + 88 =
  35. 35.346 + 59 =
  36. 36.492 + 28 =
  37. 37.130 + 99 =
  38. 38.270 + 18 =
  39. 39.105 + 28 =
  40. 40.132 + 77 =

Answer key

  1. 524
  2. 534
  3. 194
  4. 174
  5. 180
  6. 192
  7. 473
  8. 240
  9. 292
  10. 175
  11. 335
  12. 481
  13. 229
  14. 353
  15. 533
  16. 546
  17. 433
  18. 421
  19. 539
  20. 348
  21. 150
  22. 420
  23. 180
  24. 475
  25. 290
  26. 84
  27. 457
  28. 453
  29. 548
  30. 351
  31. 99
  32. 469
  33. 220
  34. 139
  35. 405
  36. 520
  37. 229
  38. 288
  39. 133
  40. 209

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths