← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 772 · 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. 1.114 + 69 =
  2. 2.122 + 49 =
  3. 3.378 + 17 =
  4. 4.478 + 87 =
  5. 5.325 + 77 =
  6. 6.73 + 17 =
  7. 7.276 + 57 =
  8. 8.221 + 38 =
  9. 9.241 + 19 =
  10. 10.454 + 29 =
  11. 11.385 + 57 =
  12. 12.452 + 97 =
  13. 13.25 + 48 =
  14. 14.271 + 97 =
  15. 15.83 + 67 =
  16. 16.112 + 78 =
  17. 17.467 + 29 =
  18. 18.129 + 58 =
  19. 19.33 + 37 =
  20. 20.171 + 18 =
  21. 21.71 + 79 =
  22. 22.395 + 68 =
  23. 23.411 + 79 =
  24. 24.124 + 77 =
  25. 25.155 + 99 =
  26. 26.310 + 79 =
  27. 27.341 + 18 =
  28. 28.294 + 29 =
  29. 29.40 + 89 =
  30. 30.128 + 97 =
  31. 31.233 + 77 =
  32. 32.94 + 98 =
  33. 33.203 + 99 =
  34. 34.76 + 48 =
  35. 35.169 + 99 =
  36. 36.92 + 28 =
  37. 37.191 + 18 =
  38. 38.120 + 29 =
  39. 39.454 + 48 =
  40. 40.78 + 17 =

Answer key

  1. 183
  2. 171
  3. 395
  4. 565
  5. 402
  6. 90
  7. 333
  8. 259
  9. 260
  10. 483
  11. 442
  12. 549
  13. 73
  14. 368
  15. 150
  16. 190
  17. 496
  18. 187
  19. 70
  20. 189
  21. 150
  22. 463
  23. 490
  24. 201
  25. 254
  26. 389
  27. 359
  28. 323
  29. 129
  30. 225
  31. 310
  32. 192
  33. 302
  34. 124
  35. 268
  36. 120
  37. 209
  38. 149
  39. 502
  40. 95

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