← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 134 · 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. 1.117 + 38 =
  2. 2.142 + 77 =
  3. 3.69 + 27 =
  4. 4.225 + 87 =
  5. 5.35 + 18 =
  6. 6.183 + 19 =
  7. 7.258 + 68 =
  8. 8.112 + 48 =
  9. 9.306 + 97 =
  10. 10.287 + 89 =
  11. 11.388 + 39 =
  12. 12.340 + 38 =
  13. 13.131 + 29 =
  14. 14.494 + 78 =
  15. 15.114 + 18 =
  16. 16.84 + 58 =
  17. 17.447 + 57 =
  18. 18.47 + 78 =
  19. 19.69 + 18 =
  20. 20.252 + 17 =
  21. 21.112 + 29 =
  22. 22.111 + 67 =
  23. 23.259 + 48 =
  24. 24.327 + 89 =
  25. 25.273 + 39 =
  26. 26.43 + 79 =
  27. 27.212 + 87 =
  28. 28.280 + 98 =
  29. 29.114 + 27 =
  30. 30.493 + 18 =
  31. 31.62 + 68 =
  32. 32.44 + 49 =
  33. 33.390 + 68 =
  34. 34.192 + 68 =
  35. 35.493 + 88 =
  36. 36.374 + 29 =
  37. 37.256 + 47 =
  38. 38.436 + 17 =
  39. 39.46 + 67 =
  40. 40.355 + 38 =

Answer key

  1. 155
  2. 219
  3. 96
  4. 312
  5. 53
  6. 202
  7. 326
  8. 160
  9. 403
  10. 376
  11. 427
  12. 378
  13. 160
  14. 572
  15. 132
  16. 142
  17. 504
  18. 125
  19. 87
  20. 269
  21. 141
  22. 178
  23. 307
  24. 416
  25. 312
  26. 122
  27. 299
  28. 378
  29. 141
  30. 511
  31. 130
  32. 93
  33. 458
  34. 260
  35. 581
  36. 403
  37. 303
  38. 453
  39. 113
  40. 393

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