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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 980 · 40 questions
TalentJR

The trick (Count the places): Forget the points and multiply the whole numbers. Count all the digits after the points in the question. Put the point that many places from the right, then check by rounding.

NameDateTime takenScore ___ / 40
  1. 1.8.1 × 3.9 — where does the decimal point go? (a) 315.9 (b) 31.59 (c) 0.3159 (d) 3.159
  2. 2.9.7 × 3.5 — where does the decimal point go? (a) 3.395 (b) 339.5 (c) 33.95 (d) 0.3395
  3. 3.9.6 × 4 — where does the decimal point go? (a) 38.4 (b) 3.84 (c) 384 (d) 0.384
  4. 4.7.3 × 8 — where does the decimal point go? (a) 5.84 (b) 0.584 (c) 584 (d) 58.4
  5. 5.5.5 × 4.3 — where does the decimal point go? (a) 23.65 (b) 2.365 (c) 0.2365 (d) 236.5
  6. 6.0.22 × 7 — where does the decimal point go? (a) 0.0154 (b) 0.154 (c) 15.4 (d) 1.54
  7. 7.8.4 × 0.2 — where does the decimal point go? (a) 1.68 (b) 0.0168 (c) 16.8 (d) 0.168
  8. 8.5.2 × 0.8 — where does the decimal point go? (a) 0.0416 (b) 0.416 (c) 41.6 (d) 4.16
  9. 9.0.89 × 46 — where does the decimal point go? (a) 0.4094 (b) 4.094 (c) 409.4 (d) 40.94
  10. 10.1.6 × 3.3 — where does the decimal point go? (a) 0.0528 (b) 52.8 (c) 5.28 (d) 0.528
  11. 11.0.33 × 7 — where does the decimal point go? (a) 2.31 (b) 0.231 (c) 23.1 (d) 0.0231
  12. 12.0.81 × 28 — where does the decimal point go? (a) 22.68 (b) 2.268 (c) 0.2268 (d) 226.8
  13. 13.0.28 × 2.3 — where does the decimal point go? (a) 0.0644 (b) 0.644 (c) 6.44 (d) 0.00644
  14. 14.6.2 × 0.3 — where does the decimal point go? (a) 1.86 (b) 18.6 (c) 0.186 (d) 0.0186
  15. 15.0.86 × 8 — where does the decimal point go? (a) 68.8 (b) 6.88 (c) 0.688 (d) 0.0688
  16. 16.8.3 × 1.6 — where does the decimal point go? (a) 13.28 (b) 0.1328 (c) 132.8 (d) 1.328
  17. 17.0.59 × 0.8 — where does the decimal point go? (a) 0.00472 (b) 0.472 (c) 0.0472 (d) 4.72
  18. 18.8.9 × 5 — where does the decimal point go? (a) 44.5 (b) 445 (c) 4.45 (d) 0.445
  19. 19.9.4 × 0.3 — where does the decimal point go? (a) 2.82 (b) 0.282 (c) 28.2 (d) 0.0282
  20. 20.6.2 × 1.9 — where does the decimal point go? (a) 11.78 (b) 0.1178 (c) 1.178 (d) 117.8
  21. 21.0.84 × 3 — where does the decimal point go? (a) 0.252 (b) 0.0252 (c) 25.2 (d) 2.52
  22. 22.7.2 × 46 — where does the decimal point go? (a) 33.12 (b) 331.2 (c) 3.312 (d) 3312
  23. 23.6.8 × 8 — where does the decimal point go? (a) 54.4 (b) 544 (c) 5.44 (d) 0.544
  24. 24.7.7 × 7 — where does the decimal point go? (a) 0.539 (b) 53.9 (c) 5.39 (d) 539
  25. 25.0.67 × 3 — where does the decimal point go? (a) 0.201 (b) 20.1 (c) 0.0201 (d) 2.01
  26. 26.8.2 × 32 — where does the decimal point go? (a) 2.624 (b) 2624 (c) 26.24 (d) 262.4
  27. 27.5.9 × 24 — where does the decimal point go? (a) 1416 (b) 14.16 (c) 141.6 (d) 1.416
  28. 28.4.8 × 23 — where does the decimal point go? (a) 1.104 (b) 11.04 (c) 110.4 (d) 1104
  29. 29.4.8 × 7 — where does the decimal point go? (a) 3.36 (b) 33.6 (c) 0.336 (d) 336
  30. 30.0.12 × 28 — where does the decimal point go? (a) 33.6 (b) 0.0336 (c) 0.336 (d) 3.36
  31. 31.0.14 × 3 — where does the decimal point go? (a) 0.042 (b) 4.2 (c) 0.42 (d) 0.0042
  32. 32.0.36 × 12 — where does the decimal point go? (a) 0.0432 (b) 43.2 (c) 0.432 (d) 4.32
  33. 33.3.2 × 2 — where does the decimal point go? (a) 0.64 (b) 64 (c) 0.064 (d) 6.4
  34. 34.4.8 × 18 — where does the decimal point go? (a) 864 (b) 0.864 (c) 8.64 (d) 86.4
  35. 35.0.76 × 3 — where does the decimal point go? (a) 0.228 (b) 0.0228 (c) 2.28 (d) 22.8
  36. 36.2.3 × 4.6 — where does the decimal point go? (a) 10.58 (b) 0.1058 (c) 1.058 (d) 105.8
  37. 37.1.3 × 8 — where does the decimal point go? (a) 0.104 (b) 10.4 (c) 104 (d) 1.04
  38. 38.9.9 × 15 — where does the decimal point go? (a) 148.5 (b) 1.485 (c) 14.85 (d) 1485
  39. 39.8.1 × 1.1 — where does the decimal point go? (a) 0.891 (b) 8.91 (c) 89.1 (d) 0.0891
  40. 40.6.2 × 3.9 — where does the decimal point go? (a) 241.8 (b) 24.18 (c) 2.418 (d) 0.2418

Answer key

  1. 31.59
  2. 33.95
  3. 38.4
  4. 58.4
  5. 23.65
  6. 1.54
  7. 1.68
  8. 4.16
  9. 40.94
  10. 5.28
  11. 2.31
  12. 22.68
  13. 0.644
  14. 1.86
  15. 6.88
  16. 13.28
  17. 0.472
  18. 44.5
  19. 2.82
  20. 11.78
  21. 2.52
  22. 331.2
  23. 54.4
  24. 53.9
  25. 2.01
  26. 262.4
  27. 141.6
  28. 110.4
  29. 33.6
  30. 3.36
  31. 0.42
  32. 4.32
  33. 6.4
  34. 86.4
  35. 2.28
  36. 10.58
  37. 10.4
  38. 148.5
  39. 8.91
  40. 24.18

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