← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 381 · 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. 1.457 + 57 =
  2. 2.230 + 77 =
  3. 3.355 + 17 =
  4. 4.460 + 69 =
  5. 5.64 + 68 =
  6. 6.186 + 87 =
  7. 7.249 + 49 =
  8. 8.113 + 58 =
  9. 9.82 + 27 =
  10. 10.389 + 38 =
  11. 11.213 + 88 =
  12. 12.251 + 58 =
  13. 13.271 + 37 =
  14. 14.237 + 47 =
  15. 15.288 + 59 =
  16. 16.287 + 29 =
  17. 17.306 + 29 =
  18. 18.330 + 17 =
  19. 19.230 + 48 =
  20. 20.127 + 59 =
  21. 21.108 + 98 =
  22. 22.346 + 67 =
  23. 23.339 + 48 =
  24. 24.97 + 28 =
  25. 25.220 + 39 =
  26. 26.327 + 27 =
  27. 27.336 + 88 =
  28. 28.198 + 97 =
  29. 29.395 + 47 =
  30. 30.341 + 78 =
  31. 31.239 + 28 =
  32. 32.57 + 77 =
  33. 33.379 + 27 =
  34. 34.258 + 98 =
  35. 35.368 + 27 =
  36. 36.459 + 88 =
  37. 37.205 + 38 =
  38. 38.168 + 88 =
  39. 39.471 + 49 =
  40. 40.99 + 57 =

Answer key

  1. 514
  2. 307
  3. 372
  4. 529
  5. 132
  6. 273
  7. 298
  8. 171
  9. 109
  10. 427
  11. 301
  12. 309
  13. 308
  14. 284
  15. 347
  16. 316
  17. 335
  18. 347
  19. 278
  20. 186
  21. 206
  22. 413
  23. 387
  24. 125
  25. 259
  26. 354
  27. 424
  28. 295
  29. 442
  30. 419
  31. 267
  32. 134
  33. 406
  34. 356
  35. 395
  36. 547
  37. 243
  38. 256
  39. 520
  40. 156

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