← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 136 · 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. 1.240 + 49 =
  2. 2.385 + 79 =
  3. 3.108 + 77 =
  4. 4.490 + 59 =
  5. 5.333 + 39 =
  6. 6.462 + 29 =
  7. 7.167 + 48 =
  8. 8.74 + 19 =
  9. 9.234 + 87 =
  10. 10.210 + 27 =
  11. 11.68 + 78 =
  12. 12.415 + 77 =
  13. 13.304 + 77 =
  14. 14.221 + 17 =
  15. 15.46 + 47 =
  16. 16.165 + 58 =
  17. 17.319 + 99 =
  18. 18.321 + 27 =
  19. 19.303 + 58 =
  20. 20.58 + 28 =
  21. 21.390 + 79 =
  22. 22.162 + 78 =
  23. 23.393 + 47 =
  24. 24.134 + 19 =
  25. 25.375 + 87 =
  26. 26.137 + 68 =
  27. 27.303 + 78 =
  28. 28.362 + 19 =
  29. 29.38 + 57 =
  30. 30.466 + 19 =
  31. 31.238 + 59 =
  32. 32.219 + 59 =
  33. 33.253 + 47 =
  34. 34.141 + 17 =
  35. 35.108 + 79 =
  36. 36.145 + 39 =
  37. 37.284 + 57 =
  38. 38.260 + 49 =
  39. 39.118 + 99 =
  40. 40.255 + 78 =

Answer key

  1. 289
  2. 464
  3. 185
  4. 549
  5. 372
  6. 491
  7. 215
  8. 93
  9. 321
  10. 237
  11. 146
  12. 492
  13. 381
  14. 238
  15. 93
  16. 223
  17. 418
  18. 348
  19. 361
  20. 86
  21. 469
  22. 240
  23. 440
  24. 153
  25. 462
  26. 205
  27. 381
  28. 381
  29. 95
  30. 485
  31. 297
  32. 278
  33. 300
  34. 158
  35. 187
  36. 184
  37. 341
  38. 309
  39. 217
  40. 333

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