← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 959 · 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. 1.107 + 79 =
  2. 2.326 + 69 =
  3. 3.368 + 67 =
  4. 4.114 + 47 =
  5. 5.178 + 39 =
  6. 6.296 + 49 =
  7. 7.184 + 98 =
  8. 8.136 + 28 =
  9. 9.325 + 87 =
  10. 10.174 + 79 =
  11. 11.309 + 17 =
  12. 12.31 + 88 =
  13. 13.65 + 79 =
  14. 14.255 + 67 =
  15. 15.151 + 28 =
  16. 16.90 + 88 =
  17. 17.425 + 68 =
  18. 18.473 + 58 =
  19. 19.94 + 98 =
  20. 20.137 + 17 =
  21. 21.400 + 17 =
  22. 22.106 + 28 =
  23. 23.399 + 49 =
  24. 24.325 + 67 =
  25. 25.199 + 89 =
  26. 26.489 + 49 =
  27. 27.164 + 67 =
  28. 28.253 + 69 =
  29. 29.99 + 48 =
  30. 30.410 + 47 =
  31. 31.459 + 49 =
  32. 32.87 + 49 =
  33. 33.340 + 88 =
  34. 34.231 + 59 =
  35. 35.27 + 99 =
  36. 36.112 + 77 =
  37. 37.141 + 17 =
  38. 38.470 + 48 =
  39. 39.168 + 37 =
  40. 40.162 + 67 =

Answer key

  1. 186
  2. 395
  3. 435
  4. 161
  5. 217
  6. 345
  7. 282
  8. 164
  9. 412
  10. 253
  11. 326
  12. 119
  13. 144
  14. 322
  15. 179
  16. 178
  17. 493
  18. 531
  19. 192
  20. 154
  21. 417
  22. 134
  23. 448
  24. 392
  25. 288
  26. 538
  27. 231
  28. 322
  29. 147
  30. 457
  31. 508
  32. 136
  33. 428
  34. 290
  35. 126
  36. 189
  37. 158
  38. 518
  39. 205
  40. 229

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