← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 588 · 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 + 28 =
  2. 2.381 + 19 =
  3. 3.364 + 59 =
  4. 4.260 + 17 =
  5. 5.67 + 39 =
  6. 6.245 + 37 =
  7. 7.422 + 78 =
  8. 8.98 + 67 =
  9. 9.135 + 98 =
  10. 10.115 + 67 =
  11. 11.245 + 27 =
  12. 12.65 + 19 =
  13. 13.137 + 18 =
  14. 14.351 + 17 =
  15. 15.386 + 18 =
  16. 16.311 + 48 =
  17. 17.299 + 97 =
  18. 18.269 + 17 =
  19. 19.131 + 38 =
  20. 20.26 + 89 =
  21. 21.208 + 97 =
  22. 22.26 + 97 =
  23. 23.155 + 17 =
  24. 24.153 + 48 =
  25. 25.168 + 69 =
  26. 26.185 + 19 =
  27. 27.154 + 78 =
  28. 28.430 + 17 =
  29. 29.56 + 17 =
  30. 30.466 + 97 =
  31. 31.27 + 29 =
  32. 32.51 + 28 =
  33. 33.206 + 97 =
  34. 34.449 + 47 =
  35. 35.41 + 87 =
  36. 36.51 + 57 =
  37. 37.255 + 17 =
  38. 38.39 + 98 =
  39. 39.33 + 19 =
  40. 40.365 + 19 =

Answer key

  1. 245
  2. 400
  3. 423
  4. 277
  5. 106
  6. 282
  7. 500
  8. 165
  9. 233
  10. 182
  11. 272
  12. 84
  13. 155
  14. 368
  15. 404
  16. 359
  17. 396
  18. 286
  19. 169
  20. 115
  21. 305
  22. 123
  23. 172
  24. 201
  25. 237
  26. 204
  27. 232
  28. 447
  29. 73
  30. 563
  31. 56
  32. 79
  33. 303
  34. 496
  35. 128
  36. 108
  37. 272
  38. 137
  39. 52
  40. 384

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