← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 584 · 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. 1.164 + 17 =
  2. 2.48 + 38 =
  3. 3.372 + 17 =
  4. 4.356 + 58 =
  5. 5.85 + 97 =
  6. 6.192 + 58 =
  7. 7.449 + 97 =
  8. 8.205 + 17 =
  9. 9.142 + 37 =
  10. 10.303 + 28 =
  11. 11.47 + 18 =
  12. 12.337 + 58 =
  13. 13.327 + 77 =
  14. 14.240 + 77 =
  15. 15.57 + 28 =
  16. 16.280 + 67 =
  17. 17.84 + 27 =
  18. 18.33 + 29 =
  19. 19.485 + 67 =
  20. 20.185 + 17 =
  21. 21.464 + 47 =
  22. 22.233 + 19 =
  23. 23.212 + 89 =
  24. 24.264 + 78 =
  25. 25.275 + 69 =
  26. 26.416 + 28 =
  27. 27.119 + 67 =
  28. 28.131 + 59 =
  29. 29.325 + 69 =
  30. 30.468 + 27 =
  31. 31.489 + 27 =
  32. 32.163 + 57 =
  33. 33.182 + 38 =
  34. 34.165 + 18 =
  35. 35.276 + 37 =
  36. 36.289 + 29 =
  37. 37.327 + 48 =
  38. 38.145 + 58 =
  39. 39.467 + 28 =
  40. 40.237 + 27 =

Answer key

  1. 181
  2. 86
  3. 389
  4. 414
  5. 182
  6. 250
  7. 546
  8. 222
  9. 179
  10. 331
  11. 65
  12. 395
  13. 404
  14. 317
  15. 85
  16. 347
  17. 111
  18. 62
  19. 552
  20. 202
  21. 511
  22. 252
  23. 301
  24. 342
  25. 344
  26. 444
  27. 186
  28. 190
  29. 394
  30. 495
  31. 516
  32. 220
  33. 220
  34. 183
  35. 313
  36. 318
  37. 375
  38. 203
  39. 495
  40. 264

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