← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 200 · 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. 1.53 + 59 =
  2. 2.305 + 57 =
  3. 3.123 + 89 =
  4. 4.38 + 37 =
  5. 5.346 + 79 =
  6. 6.468 + 28 =
  7. 7.223 + 27 =
  8. 8.38 + 27 =
  9. 9.411 + 89 =
  10. 10.400 + 18 =
  11. 11.95 + 78 =
  12. 12.118 + 68 =
  13. 13.485 + 89 =
  14. 14.440 + 38 =
  15. 15.433 + 19 =
  16. 16.420 + 28 =
  17. 17.102 + 87 =
  18. 18.491 + 88 =
  19. 19.376 + 29 =
  20. 20.494 + 27 =
  21. 21.58 + 97 =
  22. 22.372 + 67 =
  23. 23.496 + 17 =
  24. 24.252 + 59 =
  25. 25.119 + 19 =
  26. 26.95 + 38 =
  27. 27.327 + 48 =
  28. 28.221 + 39 =
  29. 29.72 + 58 =
  30. 30.211 + 37 =
  31. 31.200 + 17 =
  32. 32.435 + 18 =
  33. 33.65 + 39 =
  34. 34.281 + 99 =
  35. 35.107 + 78 =
  36. 36.469 + 59 =
  37. 37.62 + 18 =
  38. 38.254 + 69 =
  39. 39.249 + 39 =
  40. 40.347 + 47 =

Answer key

  1. 112
  2. 362
  3. 212
  4. 75
  5. 425
  6. 496
  7. 250
  8. 65
  9. 500
  10. 418
  11. 173
  12. 186
  13. 574
  14. 478
  15. 452
  16. 448
  17. 189
  18. 579
  19. 405
  20. 521
  21. 155
  22. 439
  23. 513
  24. 311
  25. 138
  26. 133
  27. 375
  28. 260
  29. 130
  30. 248
  31. 217
  32. 453
  33. 104
  34. 380
  35. 185
  36. 528
  37. 80
  38. 323
  39. 288
  40. 394

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