← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 154 · 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. 1.448 + 78 =
  2. 2.98 + 78 =
  3. 3.212 + 58 =
  4. 4.112 + 18 =
  5. 5.399 + 27 =
  6. 6.78 + 39 =
  7. 7.348 + 17 =
  8. 8.61 + 19 =
  9. 9.167 + 57 =
  10. 10.450 + 77 =
  11. 11.337 + 67 =
  12. 12.297 + 88 =
  13. 13.78 + 29 =
  14. 14.367 + 28 =
  15. 15.187 + 87 =
  16. 16.244 + 57 =
  17. 17.84 + 59 =
  18. 18.212 + 18 =
  19. 19.337 + 47 =
  20. 20.202 + 78 =
  21. 21.61 + 37 =
  22. 22.421 + 47 =
  23. 23.204 + 98 =
  24. 24.343 + 48 =
  25. 25.483 + 28 =
  26. 26.244 + 98 =
  27. 27.438 + 98 =
  28. 28.350 + 59 =
  29. 29.218 + 18 =
  30. 30.116 + 27 =
  31. 31.413 + 98 =
  32. 32.140 + 98 =
  33. 33.67 + 69 =
  34. 34.96 + 67 =
  35. 35.148 + 47 =
  36. 36.213 + 57 =
  37. 37.170 + 18 =
  38. 38.26 + 38 =
  39. 39.98 + 37 =
  40. 40.222 + 19 =

Answer key

  1. 526
  2. 176
  3. 270
  4. 130
  5. 426
  6. 117
  7. 365
  8. 80
  9. 224
  10. 527
  11. 404
  12. 385
  13. 107
  14. 395
  15. 274
  16. 301
  17. 143
  18. 230
  19. 384
  20. 280
  21. 98
  22. 468
  23. 302
  24. 391
  25. 511
  26. 342
  27. 536
  28. 409
  29. 236
  30. 143
  31. 511
  32. 238
  33. 136
  34. 163
  35. 195
  36. 270
  37. 188
  38. 64
  39. 135
  40. 241

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