← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 642 · 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. 1.370 + 99 =
  2. 2.355 + 89 =
  3. 3.235 + 58 =
  4. 4.115 + 48 =
  5. 5.179 + 29 =
  6. 6.90 + 57 =
  7. 7.369 + 37 =
  8. 8.348 + 27 =
  9. 9.160 + 77 =
  10. 10.470 + 47 =
  11. 11.286 + 87 =
  12. 12.271 + 67 =
  13. 13.162 + 99 =
  14. 14.493 + 87 =
  15. 15.65 + 47 =
  16. 16.74 + 17 =
  17. 17.53 + 68 =
  18. 18.281 + 59 =
  19. 19.93 + 39 =
  20. 20.69 + 89 =
  21. 21.237 + 57 =
  22. 22.125 + 39 =
  23. 23.374 + 19 =
  24. 24.88 + 59 =
  25. 25.261 + 67 =
  26. 26.475 + 37 =
  27. 27.81 + 68 =
  28. 28.53 + 77 =
  29. 29.91 + 59 =
  30. 30.345 + 99 =
  31. 31.306 + 78 =
  32. 32.148 + 87 =
  33. 33.217 + 18 =
  34. 34.412 + 69 =
  35. 35.306 + 88 =
  36. 36.93 + 87 =
  37. 37.152 + 19 =
  38. 38.133 + 37 =
  39. 39.329 + 69 =
  40. 40.136 + 57 =

Answer key

  1. 469
  2. 444
  3. 293
  4. 163
  5. 208
  6. 147
  7. 406
  8. 375
  9. 237
  10. 517
  11. 373
  12. 338
  13. 261
  14. 580
  15. 112
  16. 91
  17. 121
  18. 340
  19. 132
  20. 158
  21. 294
  22. 164
  23. 393
  24. 147
  25. 328
  26. 512
  27. 149
  28. 130
  29. 150
  30. 444
  31. 384
  32. 235
  33. 235
  34. 481
  35. 394
  36. 180
  37. 171
  38. 170
  39. 398
  40. 193

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