← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 292 · 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. 1.162 + 18 =
  2. 2.450 + 88 =
  3. 3.57 + 17 =
  4. 4.233 + 87 =
  5. 5.315 + 28 =
  6. 6.478 + 27 =
  7. 7.261 + 88 =
  8. 8.427 + 39 =
  9. 9.373 + 38 =
  10. 10.122 + 57 =
  11. 11.427 + 68 =
  12. 12.468 + 19 =
  13. 13.462 + 37 =
  14. 14.415 + 77 =
  15. 15.300 + 17 =
  16. 16.316 + 37 =
  17. 17.434 + 78 =
  18. 18.60 + 19 =
  19. 19.362 + 69 =
  20. 20.312 + 57 =
  21. 21.130 + 28 =
  22. 22.375 + 69 =
  23. 23.320 + 47 =
  24. 24.470 + 48 =
  25. 25.139 + 78 =
  26. 26.483 + 58 =
  27. 27.328 + 99 =
  28. 28.180 + 59 =
  29. 29.58 + 67 =
  30. 30.247 + 48 =
  31. 31.233 + 38 =
  32. 32.205 + 39 =
  33. 33.439 + 27 =
  34. 34.133 + 98 =
  35. 35.208 + 59 =
  36. 36.242 + 99 =
  37. 37.233 + 87 =
  38. 38.140 + 98 =
  39. 39.421 + 27 =
  40. 40.169 + 97 =

Answer key

  1. 180
  2. 538
  3. 74
  4. 320
  5. 343
  6. 505
  7. 349
  8. 466
  9. 411
  10. 179
  11. 495
  12. 487
  13. 499
  14. 492
  15. 317
  16. 353
  17. 512
  18. 79
  19. 431
  20. 369
  21. 158
  22. 444
  23. 367
  24. 518
  25. 217
  26. 541
  27. 427
  28. 239
  29. 125
  30. 295
  31. 271
  32. 244
  33. 466
  34. 231
  35. 267
  36. 341
  37. 320
  38. 238
  39. 448
  40. 266

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