← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 81 · 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. 1.202 + 89 =
  2. 2.99 + 48 =
  3. 3.496 + 39 =
  4. 4.227 + 17 =
  5. 5.428 + 38 =
  6. 6.157 + 87 =
  7. 7.374 + 47 =
  8. 8.200 + 29 =
  9. 9.345 + 47 =
  10. 10.112 + 47 =
  11. 11.229 + 98 =
  12. 12.190 + 39 =
  13. 13.43 + 87 =
  14. 14.61 + 87 =
  15. 15.401 + 99 =
  16. 16.85 + 98 =
  17. 17.253 + 98 =
  18. 18.384 + 29 =
  19. 19.327 + 38 =
  20. 20.468 + 47 =
  21. 21.375 + 88 =
  22. 22.299 + 78 =
  23. 23.497 + 97 =
  24. 24.118 + 38 =
  25. 25.220 + 47 =
  26. 26.297 + 98 =
  27. 27.160 + 47 =
  28. 28.161 + 28 =
  29. 29.369 + 37 =
  30. 30.466 + 77 =
  31. 31.244 + 17 =
  32. 32.50 + 18 =
  33. 33.445 + 19 =
  34. 34.423 + 89 =
  35. 35.159 + 57 =
  36. 36.198 + 57 =
  37. 37.186 + 37 =
  38. 38.140 + 68 =
  39. 39.410 + 88 =
  40. 40.132 + 29 =

Answer key

  1. 291
  2. 147
  3. 535
  4. 244
  5. 466
  6. 244
  7. 421
  8. 229
  9. 392
  10. 159
  11. 327
  12. 229
  13. 130
  14. 148
  15. 500
  16. 183
  17. 351
  18. 413
  19. 365
  20. 515
  21. 463
  22. 377
  23. 594
  24. 156
  25. 267
  26. 395
  27. 207
  28. 189
  29. 406
  30. 543
  31. 261
  32. 68
  33. 464
  34. 512
  35. 216
  36. 255
  37. 223
  38. 208
  39. 498
  40. 161

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