← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 700 · 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. 1.71 + 28 =
  2. 2.332 + 79 =
  3. 3.279 + 48 =
  4. 4.391 + 18 =
  5. 5.276 + 68 =
  6. 6.462 + 19 =
  7. 7.261 + 87 =
  8. 8.419 + 37 =
  9. 9.110 + 59 =
  10. 10.486 + 67 =
  11. 11.476 + 47 =
  12. 12.97 + 18 =
  13. 13.199 + 78 =
  14. 14.142 + 49 =
  15. 15.384 + 27 =
  16. 16.390 + 19 =
  17. 17.317 + 67 =
  18. 18.28 + 89 =
  19. 19.450 + 79 =
  20. 20.456 + 18 =
  21. 21.227 + 78 =
  22. 22.115 + 67 =
  23. 23.364 + 37 =
  24. 24.175 + 58 =
  25. 25.321 + 17 =
  26. 26.470 + 87 =
  27. 27.434 + 87 =
  28. 28.321 + 97 =
  29. 29.302 + 28 =
  30. 30.67 + 57 =
  31. 31.169 + 18 =
  32. 32.316 + 18 =
  33. 33.277 + 79 =
  34. 34.91 + 58 =
  35. 35.483 + 79 =
  36. 36.186 + 38 =
  37. 37.403 + 97 =
  38. 38.291 + 58 =
  39. 39.368 + 49 =
  40. 40.328 + 39 =

Answer key

  1. 99
  2. 411
  3. 327
  4. 409
  5. 344
  6. 481
  7. 348
  8. 456
  9. 169
  10. 553
  11. 523
  12. 115
  13. 277
  14. 191
  15. 411
  16. 409
  17. 384
  18. 117
  19. 529
  20. 474
  21. 305
  22. 182
  23. 401
  24. 233
  25. 338
  26. 557
  27. 521
  28. 418
  29. 330
  30. 124
  31. 187
  32. 334
  33. 356
  34. 149
  35. 562
  36. 224
  37. 500
  38. 349
  39. 417
  40. 367

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