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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 910 · 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. 1.474 + 88 =
  2. 2.200 + 88 =
  3. 3.432 + 99 =
  4. 4.135 + 29 =
  5. 5.481 + 57 =
  6. 6.55 + 98 =
  7. 7.271 + 47 =
  8. 8.60 + 37 =
  9. 9.109 + 29 =
  10. 10.460 + 59 =
  11. 11.85 + 49 =
  12. 12.76 + 68 =
  13. 13.445 + 19 =
  14. 14.412 + 88 =
  15. 15.137 + 59 =
  16. 16.112 + 18 =
  17. 17.78 + 87 =
  18. 18.491 + 69 =
  19. 19.284 + 48 =
  20. 20.193 + 98 =
  21. 21.379 + 18 =
  22. 22.437 + 18 =
  23. 23.387 + 39 =
  24. 24.170 + 58 =
  25. 25.447 + 69 =
  26. 26.106 + 69 =
  27. 27.255 + 17 =
  28. 28.200 + 47 =
  29. 29.386 + 39 =
  30. 30.426 + 59 =
  31. 31.118 + 37 =
  32. 32.200 + 39 =
  33. 33.380 + 19 =
  34. 34.142 + 67 =
  35. 35.187 + 29 =
  36. 36.90 + 78 =
  37. 37.74 + 78 =
  38. 38.435 + 99 =
  39. 39.61 + 49 =
  40. 40.146 + 29 =

Answer key

  1. 562
  2. 288
  3. 531
  4. 164
  5. 538
  6. 153
  7. 318
  8. 97
  9. 138
  10. 519
  11. 134
  12. 144
  13. 464
  14. 500
  15. 196
  16. 130
  17. 165
  18. 560
  19. 332
  20. 291
  21. 397
  22. 455
  23. 426
  24. 228
  25. 516
  26. 175
  27. 272
  28. 247
  29. 425
  30. 485
  31. 155
  32. 239
  33. 399
  34. 209
  35. 216
  36. 168
  37. 152
  38. 534
  39. 110
  40. 175

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