← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 483 · 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. 1.57 + 99 =
  2. 2.453 + 99 =
  3. 3.103 + 87 =
  4. 4.412 + 68 =
  5. 5.374 + 78 =
  6. 6.421 + 69 =
  7. 7.465 + 37 =
  8. 8.164 + 28 =
  9. 9.266 + 77 =
  10. 10.196 + 47 =
  11. 11.267 + 57 =
  12. 12.117 + 98 =
  13. 13.210 + 48 =
  14. 14.123 + 88 =
  15. 15.444 + 57 =
  16. 16.392 + 98 =
  17. 17.362 + 39 =
  18. 18.298 + 19 =
  19. 19.282 + 57 =
  20. 20.395 + 47 =
  21. 21.336 + 57 =
  22. 22.37 + 38 =
  23. 23.367 + 59 =
  24. 24.187 + 87 =
  25. 25.299 + 27 =
  26. 26.392 + 47 =
  27. 27.149 + 57 =
  28. 28.338 + 29 =
  29. 29.34 + 47 =
  30. 30.437 + 17 =
  31. 31.362 + 38 =
  32. 32.47 + 89 =
  33. 33.117 + 67 =
  34. 34.252 + 97 =
  35. 35.469 + 29 =
  36. 36.278 + 97 =
  37. 37.208 + 68 =
  38. 38.461 + 27 =
  39. 39.156 + 97 =
  40. 40.113 + 29 =

Answer key

  1. 156
  2. 552
  3. 190
  4. 480
  5. 452
  6. 490
  7. 502
  8. 192
  9. 343
  10. 243
  11. 324
  12. 215
  13. 258
  14. 211
  15. 501
  16. 490
  17. 401
  18. 317
  19. 339
  20. 442
  21. 393
  22. 75
  23. 426
  24. 274
  25. 326
  26. 439
  27. 206
  28. 367
  29. 81
  30. 454
  31. 400
  32. 136
  33. 184
  34. 349
  35. 498
  36. 375
  37. 276
  38. 488
  39. 253
  40. 142

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