← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 198 · 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. 1.34 + 98 =
  2. 2.345 + 68 =
  3. 3.316 + 38 =
  4. 4.44 + 27 =
  5. 5.66 + 19 =
  6. 6.318 + 57 =
  7. 7.225 + 79 =
  8. 8.229 + 37 =
  9. 9.34 + 59 =
  10. 10.367 + 97 =
  11. 11.41 + 98 =
  12. 12.69 + 17 =
  13. 13.347 + 38 =
  14. 14.337 + 59 =
  15. 15.435 + 88 =
  16. 16.49 + 39 =
  17. 17.148 + 57 =
  18. 18.435 + 48 =
  19. 19.115 + 47 =
  20. 20.147 + 88 =
  21. 21.229 + 58 =
  22. 22.140 + 87 =
  23. 23.475 + 17 =
  24. 24.269 + 47 =
  25. 25.76 + 99 =
  26. 26.386 + 77 =
  27. 27.427 + 37 =
  28. 28.408 + 28 =
  29. 29.402 + 99 =
  30. 30.189 + 17 =
  31. 31.313 + 67 =
  32. 32.78 + 88 =
  33. 33.371 + 28 =
  34. 34.495 + 29 =
  35. 35.170 + 57 =
  36. 36.33 + 28 =
  37. 37.318 + 99 =
  38. 38.199 + 29 =
  39. 39.326 + 28 =
  40. 40.169 + 98 =

Answer key

  1. 132
  2. 413
  3. 354
  4. 71
  5. 85
  6. 375
  7. 304
  8. 266
  9. 93
  10. 464
  11. 139
  12. 86
  13. 385
  14. 396
  15. 523
  16. 88
  17. 205
  18. 483
  19. 162
  20. 235
  21. 287
  22. 227
  23. 492
  24. 316
  25. 175
  26. 463
  27. 464
  28. 436
  29. 501
  30. 206
  31. 380
  32. 166
  33. 399
  34. 524
  35. 227
  36. 61
  37. 417
  38. 228
  39. 354
  40. 267

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