← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 856 · 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. 1.82 + 69 =
  2. 2.262 + 38 =
  3. 3.250 + 29 =
  4. 4.382 + 68 =
  5. 5.280 + 49 =
  6. 6.131 + 38 =
  7. 7.130 + 49 =
  8. 8.392 + 59 =
  9. 9.495 + 88 =
  10. 10.362 + 38 =
  11. 11.74 + 17 =
  12. 12.194 + 57 =
  13. 13.424 + 88 =
  14. 14.129 + 18 =
  15. 15.234 + 98 =
  16. 16.285 + 67 =
  17. 17.350 + 87 =
  18. 18.156 + 77 =
  19. 19.331 + 38 =
  20. 20.186 + 77 =
  21. 21.374 + 39 =
  22. 22.70 + 88 =
  23. 23.28 + 69 =
  24. 24.430 + 17 =
  25. 25.146 + 19 =
  26. 26.220 + 29 =
  27. 27.98 + 98 =
  28. 28.480 + 28 =
  29. 29.129 + 49 =
  30. 30.134 + 17 =
  31. 31.136 + 69 =
  32. 32.467 + 58 =
  33. 33.160 + 67 =
  34. 34.83 + 59 =
  35. 35.71 + 87 =
  36. 36.154 + 99 =
  37. 37.367 + 98 =
  38. 38.125 + 29 =
  39. 39.349 + 78 =
  40. 40.168 + 57 =

Answer key

  1. 151
  2. 300
  3. 279
  4. 450
  5. 329
  6. 169
  7. 179
  8. 451
  9. 583
  10. 400
  11. 91
  12. 251
  13. 512
  14. 147
  15. 332
  16. 352
  17. 437
  18. 233
  19. 369
  20. 263
  21. 413
  22. 158
  23. 97
  24. 447
  25. 165
  26. 249
  27. 196
  28. 508
  29. 178
  30. 151
  31. 205
  32. 525
  33. 227
  34. 142
  35. 158
  36. 253
  37. 465
  38. 154
  39. 427
  40. 225

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