← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 869 · 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. 1.404 + 27 =
  2. 2.120 + 59 =
  3. 3.268 + 18 =
  4. 4.456 + 48 =
  5. 5.35 + 29 =
  6. 6.137 + 39 =
  7. 7.380 + 57 =
  8. 8.281 + 58 =
  9. 9.215 + 19 =
  10. 10.321 + 69 =
  11. 11.399 + 69 =
  12. 12.163 + 49 =
  13. 13.103 + 37 =
  14. 14.73 + 48 =
  15. 15.56 + 17 =
  16. 16.259 + 39 =
  17. 17.179 + 27 =
  18. 18.492 + 77 =
  19. 19.440 + 38 =
  20. 20.320 + 58 =
  21. 21.275 + 68 =
  22. 22.150 + 88 =
  23. 23.405 + 19 =
  24. 24.102 + 29 =
  25. 25.142 + 77 =
  26. 26.244 + 27 =
  27. 27.466 + 69 =
  28. 28.386 + 49 =
  29. 29.434 + 28 =
  30. 30.112 + 17 =
  31. 31.362 + 67 =
  32. 32.68 + 67 =
  33. 33.92 + 57 =
  34. 34.446 + 47 =
  35. 35.378 + 77 =
  36. 36.68 + 27 =
  37. 37.222 + 48 =
  38. 38.81 + 87 =
  39. 39.110 + 78 =
  40. 40.355 + 48 =

Answer key

  1. 431
  2. 179
  3. 286
  4. 504
  5. 64
  6. 176
  7. 437
  8. 339
  9. 234
  10. 390
  11. 468
  12. 212
  13. 140
  14. 121
  15. 73
  16. 298
  17. 206
  18. 569
  19. 478
  20. 378
  21. 343
  22. 238
  23. 424
  24. 131
  25. 219
  26. 271
  27. 535
  28. 435
  29. 462
  30. 129
  31. 429
  32. 135
  33. 149
  34. 493
  35. 455
  36. 95
  37. 270
  38. 168
  39. 188
  40. 403

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