← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 520 · 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. 1.474 + 78 =
  2. 2.133 + 29 =
  3. 3.223 + 67 =
  4. 4.427 + 69 =
  5. 5.101 + 89 =
  6. 6.412 + 18 =
  7. 7.114 + 19 =
  8. 8.463 + 27 =
  9. 9.242 + 58 =
  10. 10.496 + 49 =
  11. 11.209 + 59 =
  12. 12.156 + 19 =
  13. 13.279 + 98 =
  14. 14.252 + 97 =
  15. 15.251 + 27 =
  16. 16.33 + 58 =
  17. 17.244 + 27 =
  18. 18.134 + 58 =
  19. 19.197 + 19 =
  20. 20.484 + 37 =
  21. 21.470 + 19 =
  22. 22.83 + 98 =
  23. 23.261 + 49 =
  24. 24.450 + 17 =
  25. 25.429 + 99 =
  26. 26.66 + 77 =
  27. 27.432 + 38 =
  28. 28.216 + 17 =
  29. 29.159 + 67 =
  30. 30.466 + 38 =
  31. 31.317 + 87 =
  32. 32.118 + 37 =
  33. 33.343 + 89 =
  34. 34.297 + 87 =
  35. 35.73 + 78 =
  36. 36.270 + 37 =
  37. 37.112 + 48 =
  38. 38.76 + 49 =
  39. 39.92 + 97 =
  40. 40.35 + 79 =

Answer key

  1. 552
  2. 162
  3. 290
  4. 496
  5. 190
  6. 430
  7. 133
  8. 490
  9. 300
  10. 545
  11. 268
  12. 175
  13. 377
  14. 349
  15. 278
  16. 91
  17. 271
  18. 192
  19. 216
  20. 521
  21. 489
  22. 181
  23. 310
  24. 467
  25. 528
  26. 143
  27. 470
  28. 233
  29. 226
  30. 504
  31. 404
  32. 155
  33. 432
  34. 384
  35. 151
  36. 307
  37. 160
  38. 125
  39. 189
  40. 114

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