← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 511 · 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. 1.38 + 17 =
  2. 2.217 + 79 =
  3. 3.179 + 98 =
  4. 4.196 + 67 =
  5. 5.213 + 97 =
  6. 6.130 + 29 =
  7. 7.51 + 98 =
  8. 8.89 + 57 =
  9. 9.90 + 28 =
  10. 10.116 + 47 =
  11. 11.72 + 89 =
  12. 12.60 + 27 =
  13. 13.367 + 17 =
  14. 14.202 + 88 =
  15. 15.396 + 48 =
  16. 16.202 + 87 =
  17. 17.88 + 28 =
  18. 18.393 + 58 =
  19. 19.250 + 18 =
  20. 20.26 + 19 =
  21. 21.279 + 27 =
  22. 22.77 + 57 =
  23. 23.54 + 27 =
  24. 24.157 + 58 =
  25. 25.88 + 98 =
  26. 26.237 + 38 =
  27. 27.413 + 49 =
  28. 28.38 + 77 =
  29. 29.497 + 59 =
  30. 30.319 + 68 =
  31. 31.222 + 49 =
  32. 32.453 + 17 =
  33. 33.354 + 97 =
  34. 34.221 + 18 =
  35. 35.121 + 89 =
  36. 36.50 + 27 =
  37. 37.344 + 39 =
  38. 38.456 + 49 =
  39. 39.179 + 17 =
  40. 40.120 + 49 =

Answer key

  1. 55
  2. 296
  3. 277
  4. 263
  5. 310
  6. 159
  7. 149
  8. 146
  9. 118
  10. 163
  11. 161
  12. 87
  13. 384
  14. 290
  15. 444
  16. 289
  17. 116
  18. 451
  19. 268
  20. 45
  21. 306
  22. 134
  23. 81
  24. 215
  25. 186
  26. 275
  27. 462
  28. 115
  29. 556
  30. 387
  31. 271
  32. 470
  33. 451
  34. 239
  35. 210
  36. 77
  37. 383
  38. 505
  39. 196
  40. 169

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