← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 112 · 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. 1.217 + 67 =
  2. 2.236 + 67 =
  3. 3.441 + 29 =
  4. 4.467 + 37 =
  5. 5.181 + 88 =
  6. 6.208 + 39 =
  7. 7.250 + 17 =
  8. 8.116 + 89 =
  9. 9.402 + 29 =
  10. 10.270 + 89 =
  11. 11.185 + 37 =
  12. 12.244 + 37 =
  13. 13.160 + 87 =
  14. 14.406 + 98 =
  15. 15.260 + 77 =
  16. 16.29 + 99 =
  17. 17.456 + 79 =
  18. 18.339 + 99 =
  19. 19.225 + 38 =
  20. 20.381 + 69 =
  21. 21.494 + 47 =
  22. 22.352 + 97 =
  23. 23.370 + 69 =
  24. 24.40 + 37 =
  25. 25.344 + 57 =
  26. 26.362 + 48 =
  27. 27.276 + 17 =
  28. 28.229 + 49 =
  29. 29.211 + 77 =
  30. 30.239 + 99 =
  31. 31.427 + 78 =
  32. 32.314 + 28 =
  33. 33.192 + 18 =
  34. 34.142 + 67 =
  35. 35.177 + 89 =
  36. 36.469 + 18 =
  37. 37.410 + 38 =
  38. 38.167 + 79 =
  39. 39.309 + 97 =
  40. 40.256 + 59 =

Answer key

  1. 284
  2. 303
  3. 470
  4. 504
  5. 269
  6. 247
  7. 267
  8. 205
  9. 431
  10. 359
  11. 222
  12. 281
  13. 247
  14. 504
  15. 337
  16. 128
  17. 535
  18. 438
  19. 263
  20. 450
  21. 541
  22. 449
  23. 439
  24. 77
  25. 401
  26. 410
  27. 293
  28. 278
  29. 288
  30. 338
  31. 505
  32. 342
  33. 210
  34. 209
  35. 266
  36. 487
  37. 448
  38. 246
  39. 406
  40. 315

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