← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 816 · 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. 1.431 + 49 =
  2. 2.137 + 58 =
  3. 3.301 + 38 =
  4. 4.116 + 39 =
  5. 5.112 + 18 =
  6. 6.121 + 39 =
  7. 7.479 + 98 =
  8. 8.275 + 89 =
  9. 9.309 + 59 =
  10. 10.30 + 68 =
  11. 11.82 + 18 =
  12. 12.127 + 39 =
  13. 13.393 + 17 =
  14. 14.332 + 29 =
  15. 15.484 + 27 =
  16. 16.52 + 89 =
  17. 17.258 + 28 =
  18. 18.66 + 17 =
  19. 19.369 + 29 =
  20. 20.82 + 29 =
  21. 21.309 + 27 =
  22. 22.162 + 87 =
  23. 23.329 + 79 =
  24. 24.418 + 48 =
  25. 25.95 + 39 =
  26. 26.180 + 48 =
  27. 27.435 + 27 =
  28. 28.48 + 69 =
  29. 29.346 + 39 =
  30. 30.138 + 28 =
  31. 31.398 + 67 =
  32. 32.176 + 37 =
  33. 33.41 + 87 =
  34. 34.459 + 78 =
  35. 35.47 + 47 =
  36. 36.309 + 37 =
  37. 37.208 + 59 =
  38. 38.476 + 27 =
  39. 39.175 + 37 =
  40. 40.259 + 39 =

Answer key

  1. 480
  2. 195
  3. 339
  4. 155
  5. 130
  6. 160
  7. 577
  8. 364
  9. 368
  10. 98
  11. 100
  12. 166
  13. 410
  14. 361
  15. 511
  16. 141
  17. 286
  18. 83
  19. 398
  20. 111
  21. 336
  22. 249
  23. 408
  24. 466
  25. 134
  26. 228
  27. 462
  28. 117
  29. 385
  30. 166
  31. 465
  32. 213
  33. 128
  34. 537
  35. 94
  36. 346
  37. 267
  38. 503
  39. 212
  40. 298

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