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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 544 · 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. 1.2.5 × 5 — where does the decimal point go? (a) 1.25 (b) 0.125 (c) 125 (d) 12.5
  2. 2.3.7 × 0.6 — where does the decimal point go? (a) 2.22 (b) 0.222 (c) 0.0222 (d) 22.2
  3. 3.0.12 × 0.6 — where does the decimal point go? (a) 0.072 (b) 0.72 (c) 0.00072 (d) 0.0072
  4. 4.0.31 × 7 — where does the decimal point go? (a) 2.17 (b) 21.7 (c) 0.217 (d) 0.0217
  5. 5.0.59 × 41 — where does the decimal point go? (a) 0.2419 (b) 2.419 (c) 24.19 (d) 241.9
  6. 6.0.91 × 5 — where does the decimal point go? (a) 4.55 (b) 0.0455 (c) 0.455 (d) 45.5
  7. 7.7.6 × 2.8 — where does the decimal point go? (a) 2.128 (b) 212.8 (c) 21.28 (d) 0.2128
  8. 8.4.3 × 0.9 — where does the decimal point go? (a) 0.0387 (b) 3.87 (c) 38.7 (d) 0.387
  9. 9.3.2 × 3 — where does the decimal point go? (a) 9.6 (b) 0.96 (c) 96 (d) 0.096
  10. 10.2.7 × 0.3 — where does the decimal point go? (a) 0.0081 (b) 0.081 (c) 0.81 (d) 8.1
  11. 11.0.26 × 3.4 — where does the decimal point go? (a) 0.00884 (b) 0.884 (c) 0.0884 (d) 8.84
  12. 12.0.52 × 4 — where does the decimal point go? (a) 20.8 (b) 2.08 (c) 0.0208 (d) 0.208
  13. 13.0.17 × 15 — where does the decimal point go? (a) 0.255 (b) 25.5 (c) 0.0255 (d) 2.55
  14. 14.3.9 × 1.6 — where does the decimal point go? (a) 62.4 (b) 6.24 (c) 0.624 (d) 0.0624
  15. 15.4.1 × 2.1 — where does the decimal point go? (a) 8.61 (b) 0.861 (c) 86.1 (d) 0.0861
  16. 16.1.9 × 0.8 — where does the decimal point go? (a) 0.152 (b) 1.52 (c) 15.2 (d) 0.0152
  17. 17.0.23 × 4 — where does the decimal point go? (a) 0.92 (b) 9.2 (c) 0.092 (d) 0.0092
  18. 18.0.78 × 1.8 — where does the decimal point go? (a) 0.1404 (b) 0.01404 (c) 1.404 (d) 14.04
  19. 19.0.39 × 9 — where does the decimal point go? (a) 0.0351 (b) 0.351 (c) 3.51 (d) 35.1
  20. 20.0.96 × 49 — where does the decimal point go? (a) 4.704 (b) 470.4 (c) 0.4704 (d) 47.04
  21. 21.4.9 × 4 — where does the decimal point go? (a) 196 (b) 1.96 (c) 0.196 (d) 19.6
  22. 22.2.4 × 24 — where does the decimal point go? (a) 57.6 (b) 5.76 (c) 576 (d) 0.576
  23. 23.0.41 × 0.2 — where does the decimal point go? (a) 0.0082 (b) 0.82 (c) 0.082 (d) 0.00082
  24. 24.0.33 × 9 — where does the decimal point go? (a) 2.97 (b) 0.0297 (c) 0.297 (d) 29.7
  25. 25.7.4 × 3 — where does the decimal point go? (a) 0.222 (b) 2.22 (c) 22.2 (d) 222
  26. 26.0.83 × 3 — where does the decimal point go? (a) 0.249 (b) 24.9 (c) 0.0249 (d) 2.49
  27. 27.3.7 × 18 — where does the decimal point go? (a) 66.6 (b) 666 (c) 0.666 (d) 6.66
  28. 28.5.8 × 3.8 — where does the decimal point go? (a) 0.2204 (b) 2.204 (c) 220.4 (d) 22.04
  29. 29.0.81 × 4.3 — where does the decimal point go? (a) 0.3483 (b) 34.83 (c) 0.03483 (d) 3.483
  30. 30.0.94 × 6 — where does the decimal point go? (a) 0.564 (b) 0.0564 (c) 5.64 (d) 56.4
  31. 31.0.22 × 0.6 — where does the decimal point go? (a) 0.0132 (b) 1.32 (c) 0.00132 (d) 0.132
  32. 32.9.6 × 0.7 — where does the decimal point go? (a) 67.2 (b) 6.72 (c) 0.672 (d) 0.0672
  33. 33.0.27 × 5 — where does the decimal point go? (a) 0.0135 (b) 0.135 (c) 13.5 (d) 1.35
  34. 34.2.9 × 0.8 — where does the decimal point go? (a) 0.232 (b) 0.0232 (c) 23.2 (d) 2.32
  35. 35.0.19 × 1.8 — where does the decimal point go? (a) 0.342 (b) 0.0342 (c) 3.42 (d) 0.00342
  36. 36.8.7 × 9 — where does the decimal point go? (a) 78.3 (b) 7.83 (c) 783 (d) 0.783
  37. 37.7.2 × 3.8 — where does the decimal point go? (a) 0.2736 (b) 27.36 (c) 273.6 (d) 2.736
  38. 38.9.6 × 0.4 — where does the decimal point go? (a) 0.384 (b) 3.84 (c) 0.0384 (d) 38.4
  39. 39.0.31 × 8 — where does the decimal point go? (a) 0.0248 (b) 0.248 (c) 2.48 (d) 24.8
  40. 40.0.61 × 23 — where does the decimal point go? (a) 0.1403 (b) 14.03 (c) 140.3 (d) 1.403

Answer key

  1. 12.5
  2. 2.22
  3. 0.072
  4. 2.17
  5. 24.19
  6. 4.55
  7. 21.28
  8. 3.87
  9. 9.6
  10. 0.81
  11. 0.884
  12. 2.08
  13. 2.55
  14. 6.24
  15. 8.61
  16. 1.52
  17. 0.92
  18. 1.404
  19. 3.51
  20. 47.04
  21. 19.6
  22. 57.6
  23. 0.082
  24. 2.97
  25. 22.2
  26. 2.49
  27. 66.6
  28. 22.04
  29. 3.483
  30. 5.64
  31. 0.132
  32. 6.72
  33. 1.35
  34. 2.32
  35. 0.342
  36. 78.3
  37. 27.36
  38. 3.84
  39. 2.48
  40. 14.03

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