← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 688 · 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. 1.453 + 29 =
  2. 2.140 + 27 =
  3. 3.344 + 67 =
  4. 4.130 + 67 =
  5. 5.371 + 67 =
  6. 6.258 + 28 =
  7. 7.182 + 49 =
  8. 8.243 + 39 =
  9. 9.296 + 97 =
  10. 10.161 + 49 =
  11. 11.301 + 58 =
  12. 12.468 + 29 =
  13. 13.183 + 59 =
  14. 14.135 + 49 =
  15. 15.497 + 87 =
  16. 16.449 + 97 =
  17. 17.305 + 18 =
  18. 18.490 + 89 =
  19. 19.498 + 47 =
  20. 20.483 + 27 =
  21. 21.186 + 27 =
  22. 22.478 + 57 =
  23. 23.146 + 58 =
  24. 24.210 + 47 =
  25. 25.181 + 47 =
  26. 26.211 + 98 =
  27. 27.39 + 37 =
  28. 28.133 + 87 =
  29. 29.412 + 29 =
  30. 30.114 + 87 =
  31. 31.360 + 47 =
  32. 32.310 + 77 =
  33. 33.243 + 79 =
  34. 34.79 + 87 =
  35. 35.361 + 38 =
  36. 36.329 + 58 =
  37. 37.235 + 48 =
  38. 38.361 + 68 =
  39. 39.468 + 37 =
  40. 40.220 + 39 =

Answer key

  1. 482
  2. 167
  3. 411
  4. 197
  5. 438
  6. 286
  7. 231
  8. 282
  9. 393
  10. 210
  11. 359
  12. 497
  13. 242
  14. 184
  15. 584
  16. 546
  17. 323
  18. 579
  19. 545
  20. 510
  21. 213
  22. 535
  23. 204
  24. 257
  25. 228
  26. 309
  27. 76
  28. 220
  29. 441
  30. 201
  31. 407
  32. 387
  33. 322
  34. 166
  35. 399
  36. 387
  37. 283
  38. 429
  39. 505
  40. 259

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