← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 321 · 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. 1.379 + 37 =
  2. 2.401 + 87 =
  3. 3.157 + 47 =
  4. 4.60 + 98 =
  5. 5.242 + 89 =
  6. 6.496 + 59 =
  7. 7.54 + 18 =
  8. 8.261 + 97 =
  9. 9.124 + 28 =
  10. 10.366 + 28 =
  11. 11.122 + 29 =
  12. 12.116 + 88 =
  13. 13.453 + 38 =
  14. 14.234 + 29 =
  15. 15.61 + 59 =
  16. 16.359 + 57 =
  17. 17.385 + 88 =
  18. 18.360 + 28 =
  19. 19.114 + 19 =
  20. 20.110 + 78 =
  21. 21.302 + 67 =
  22. 22.435 + 49 =
  23. 23.430 + 78 =
  24. 24.419 + 47 =
  25. 25.359 + 38 =
  26. 26.496 + 29 =
  27. 27.245 + 68 =
  28. 28.156 + 88 =
  29. 29.445 + 18 =
  30. 30.378 + 78 =
  31. 31.421 + 19 =
  32. 32.379 + 87 =
  33. 33.94 + 69 =
  34. 34.308 + 59 =
  35. 35.374 + 58 =
  36. 36.342 + 39 =
  37. 37.128 + 58 =
  38. 38.229 + 39 =
  39. 39.106 + 89 =
  40. 40.228 + 39 =

Answer key

  1. 416
  2. 488
  3. 204
  4. 158
  5. 331
  6. 555
  7. 72
  8. 358
  9. 152
  10. 394
  11. 151
  12. 204
  13. 491
  14. 263
  15. 120
  16. 416
  17. 473
  18. 388
  19. 133
  20. 188
  21. 369
  22. 484
  23. 508
  24. 466
  25. 397
  26. 525
  27. 313
  28. 244
  29. 463
  30. 456
  31. 440
  32. 466
  33. 163
  34. 367
  35. 432
  36. 381
  37. 186
  38. 268
  39. 195
  40. 267

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