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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 959 · 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. 1.5.4 × 7 — where does the decimal point go? (a) 3.78 (b) 37.8 (c) 0.378 (d) 378
  2. 2.1.8 × 6 — where does the decimal point go? (a) 0.108 (b) 108 (c) 10.8 (d) 1.08
  3. 3.6.9 × 18 — where does the decimal point go? (a) 124.2 (b) 12.42 (c) 1242 (d) 1.242
  4. 4.3.7 × 6 — where does the decimal point go? (a) 0.222 (b) 222 (c) 22.2 (d) 2.22
  5. 5.0.29 × 2 — where does the decimal point go? (a) 0.058 (b) 0.58 (c) 5.8 (d) 0.0058
  6. 6.1.7 × 2 — where does the decimal point go? (a) 0.034 (b) 3.4 (c) 34 (d) 0.34
  7. 7.0.75 × 49 — where does the decimal point go? (a) 3.675 (b) 36.75 (c) 0.3675 (d) 367.5
  8. 8.6.9 × 0.3 — where does the decimal point go? (a) 20.7 (b) 2.07 (c) 0.0207 (d) 0.207
  9. 9.0.85 × 0.9 — where does the decimal point go? (a) 0.00765 (b) 0.765 (c) 7.65 (d) 0.0765
  10. 10.6.9 × 0.9 — where does the decimal point go? (a) 6.21 (b) 62.1 (c) 0.621 (d) 0.0621
  11. 11.9.3 × 7 — where does the decimal point go? (a) 6.51 (b) 0.651 (c) 651 (d) 65.1
  12. 12.4.2 × 1.8 — where does the decimal point go? (a) 75.6 (b) 0.0756 (c) 7.56 (d) 0.756
  13. 13.6.3 × 3 — where does the decimal point go? (a) 1.89 (b) 189 (c) 18.9 (d) 0.189
  14. 14.8.4 × 7 — where does the decimal point go? (a) 5.88 (b) 588 (c) 58.8 (d) 0.588
  15. 15.0.24 × 43 — where does the decimal point go? (a) 10.32 (b) 0.1032 (c) 1.032 (d) 103.2
  16. 16.0.21 × 45 — where does the decimal point go? (a) 0.0945 (b) 94.5 (c) 9.45 (d) 0.945
  17. 17.0.84 × 0.6 — where does the decimal point go? (a) 0.0504 (b) 0.504 (c) 0.00504 (d) 5.04
  18. 18.2.3 × 3 — where does the decimal point go? (a) 6.9 (b) 0.069 (c) 0.69 (d) 69
  19. 19.2.7 × 4 — where does the decimal point go? (a) 10.8 (b) 1.08 (c) 0.108 (d) 108
  20. 20.0.22 × 0.7 — where does the decimal point go? (a) 0.0154 (b) 0.00154 (c) 0.154 (d) 1.54
  21. 21.5.7 × 4 — where does the decimal point go? (a) 228 (b) 22.8 (c) 2.28 (d) 0.228
  22. 22.0.26 × 8 — where does the decimal point go? (a) 0.0208 (b) 0.208 (c) 20.8 (d) 2.08
  23. 23.0.88 × 28 — where does the decimal point go? (a) 2.464 (b) 246.4 (c) 0.2464 (d) 24.64
  24. 24.0.72 × 34 — where does the decimal point go? (a) 24.48 (b) 2.448 (c) 0.2448 (d) 244.8
  25. 25.8.8 × 8 — where does the decimal point go? (a) 70.4 (b) 704 (c) 7.04 (d) 0.704
  26. 26.4.8 × 16 — where does the decimal point go? (a) 76.8 (b) 768 (c) 7.68 (d) 0.768
  27. 27.9.7 × 0.2 — where does the decimal point go? (a) 19.4 (b) 1.94 (c) 0.194 (d) 0.0194
  28. 28.0.12 × 0.6 — where does the decimal point go? (a) 0.72 (b) 0.00072 (c) 0.0072 (d) 0.072
  29. 29.5.4 × 9 — where does the decimal point go? (a) 0.486 (b) 48.6 (c) 486 (d) 4.86
  30. 30.9.1 × 4 — where does the decimal point go? (a) 364 (b) 0.364 (c) 3.64 (d) 36.4
  31. 31.0.78 × 6 — where does the decimal point go? (a) 0.0468 (b) 46.8 (c) 4.68 (d) 0.468
  32. 32.1.7 × 9 — where does the decimal point go? (a) 15.3 (b) 0.153 (c) 153 (d) 1.53
  33. 33.0.42 × 11 — where does the decimal point go? (a) 4.62 (b) 0.462 (c) 0.0462 (d) 46.2
  34. 34.0.86 × 39 — where does the decimal point go? (a) 33.54 (b) 3.354 (c) 335.4 (d) 0.3354
  35. 35.0.51 × 8 — where does the decimal point go? (a) 0.408 (b) 4.08 (c) 0.0408 (d) 40.8
  36. 36.6.9 × 11 — where does the decimal point go? (a) 7.59 (b) 759 (c) 75.9 (d) 0.759
  37. 37.0.28 × 3.6 — where does the decimal point go? (a) 0.1008 (b) 1.008 (c) 0.01008 (d) 10.08
  38. 38.0.45 × 3.5 — where does the decimal point go? (a) 1.575 (b) 0.01575 (c) 15.75 (d) 0.1575
  39. 39.0.42 × 0.7 — where does the decimal point go? (a) 0.0294 (b) 0.294 (c) 2.94 (d) 0.00294
  40. 40.3.6 × 6 — where does the decimal point go? (a) 0.216 (b) 2.16 (c) 216 (d) 21.6

Answer key

  1. 37.8
  2. 10.8
  3. 124.2
  4. 22.2
  5. 0.58
  6. 3.4
  7. 36.75
  8. 2.07
  9. 0.765
  10. 6.21
  11. 65.1
  12. 7.56
  13. 18.9
  14. 58.8
  15. 10.32
  16. 9.45
  17. 0.504
  18. 6.9
  19. 10.8
  20. 0.154
  21. 22.8
  22. 2.08
  23. 24.64
  24. 24.48
  25. 70.4
  26. 76.8
  27. 1.94
  28. 0.072
  29. 48.6
  30. 36.4
  31. 4.68
  32. 15.3
  33. 4.62
  34. 33.54
  35. 4.08
  36. 75.9
  37. 1.008
  38. 1.575
  39. 0.294
  40. 21.6

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