← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 567 · 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. 1.57 + 69 =
  2. 2.365 + 59 =
  3. 3.217 + 87 =
  4. 4.25 + 29 =
  5. 5.178 + 29 =
  6. 6.304 + 58 =
  7. 7.292 + 17 =
  8. 8.283 + 57 =
  9. 9.266 + 98 =
  10. 10.102 + 99 =
  11. 11.223 + 58 =
  12. 12.133 + 37 =
  13. 13.142 + 49 =
  14. 14.58 + 38 =
  15. 15.456 + 57 =
  16. 16.459 + 97 =
  17. 17.298 + 58 =
  18. 18.160 + 89 =
  19. 19.351 + 88 =
  20. 20.148 + 18 =
  21. 21.290 + 29 =
  22. 22.385 + 69 =
  23. 23.472 + 47 =
  24. 24.52 + 78 =
  25. 25.213 + 97 =
  26. 26.380 + 59 =
  27. 27.375 + 27 =
  28. 28.74 + 77 =
  29. 29.87 + 68 =
  30. 30.395 + 87 =
  31. 31.264 + 19 =
  32. 32.310 + 99 =
  33. 33.50 + 68 =
  34. 34.341 + 37 =
  35. 35.145 + 58 =
  36. 36.221 + 48 =
  37. 37.153 + 39 =
  38. 38.487 + 77 =
  39. 39.301 + 18 =
  40. 40.446 + 27 =

Answer key

  1. 126
  2. 424
  3. 304
  4. 54
  5. 207
  6. 362
  7. 309
  8. 340
  9. 364
  10. 201
  11. 281
  12. 170
  13. 191
  14. 96
  15. 513
  16. 556
  17. 356
  18. 249
  19. 439
  20. 166
  21. 319
  22. 454
  23. 519
  24. 130
  25. 310
  26. 439
  27. 402
  28. 151
  29. 155
  30. 482
  31. 283
  32. 409
  33. 118
  34. 378
  35. 203
  36. 269
  37. 192
  38. 564
  39. 319
  40. 473

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