← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 805 · 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. 1.108 + 97 =
  2. 2.322 + 78 =
  3. 3.118 + 38 =
  4. 4.322 + 68 =
  5. 5.240 + 79 =
  6. 6.356 + 29 =
  7. 7.36 + 17 =
  8. 8.208 + 77 =
  9. 9.442 + 49 =
  10. 10.61 + 89 =
  11. 11.217 + 57 =
  12. 12.331 + 19 =
  13. 13.95 + 99 =
  14. 14.172 + 37 =
  15. 15.126 + 18 =
  16. 16.39 + 19 =
  17. 17.400 + 58 =
  18. 18.399 + 89 =
  19. 19.277 + 77 =
  20. 20.51 + 77 =
  21. 21.241 + 88 =
  22. 22.385 + 28 =
  23. 23.400 + 19 =
  24. 24.76 + 28 =
  25. 25.484 + 28 =
  26. 26.366 + 79 =
  27. 27.142 + 17 =
  28. 28.461 + 39 =
  29. 29.231 + 89 =
  30. 30.349 + 97 =
  31. 31.388 + 27 =
  32. 32.311 + 98 =
  33. 33.116 + 17 =
  34. 34.450 + 59 =
  35. 35.155 + 27 =
  36. 36.358 + 69 =
  37. 37.270 + 69 =
  38. 38.447 + 78 =
  39. 39.159 + 37 =
  40. 40.209 + 58 =

Answer key

  1. 205
  2. 400
  3. 156
  4. 390
  5. 319
  6. 385
  7. 53
  8. 285
  9. 491
  10. 150
  11. 274
  12. 350
  13. 194
  14. 209
  15. 144
  16. 58
  17. 458
  18. 488
  19. 354
  20. 128
  21. 329
  22. 413
  23. 419
  24. 104
  25. 512
  26. 445
  27. 159
  28. 500
  29. 320
  30. 446
  31. 415
  32. 409
  33. 133
  34. 509
  35. 182
  36. 427
  37. 339
  38. 525
  39. 196
  40. 267

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