← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 414 · 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. 1.445 + 38 =
  2. 2.75 + 67 =
  3. 3.365 + 48 =
  4. 4.324 + 47 =
  5. 5.136 + 67 =
  6. 6.99 + 98 =
  7. 7.274 + 27 =
  8. 8.232 + 29 =
  9. 9.215 + 38 =
  10. 10.433 + 58 =
  11. 11.474 + 29 =
  12. 12.53 + 18 =
  13. 13.258 + 89 =
  14. 14.275 + 38 =
  15. 15.121 + 77 =
  16. 16.102 + 19 =
  17. 17.160 + 17 =
  18. 18.192 + 19 =
  19. 19.62 + 89 =
  20. 20.488 + 49 =
  21. 21.55 + 49 =
  22. 22.336 + 48 =
  23. 23.395 + 87 =
  24. 24.279 + 69 =
  25. 25.101 + 28 =
  26. 26.346 + 89 =
  27. 27.58 + 77 =
  28. 28.295 + 68 =
  29. 29.195 + 47 =
  30. 30.42 + 17 =
  31. 31.248 + 29 =
  32. 32.360 + 69 =
  33. 33.79 + 27 =
  34. 34.44 + 99 =
  35. 35.448 + 27 =
  36. 36.45 + 39 =
  37. 37.37 + 88 =
  38. 38.202 + 88 =
  39. 39.488 + 39 =
  40. 40.62 + 68 =

Answer key

  1. 483
  2. 142
  3. 413
  4. 371
  5. 203
  6. 197
  7. 301
  8. 261
  9. 253
  10. 491
  11. 503
  12. 71
  13. 347
  14. 313
  15. 198
  16. 121
  17. 177
  18. 211
  19. 151
  20. 537
  21. 104
  22. 384
  23. 482
  24. 348
  25. 129
  26. 435
  27. 135
  28. 363
  29. 242
  30. 59
  31. 277
  32. 429
  33. 106
  34. 143
  35. 475
  36. 84
  37. 125
  38. 290
  39. 527
  40. 130

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