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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 479 · 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. 1.2.1 × 3 — where does the decimal point go? (a) 0.063 (b) 63 (c) 6.3 (d) 0.63
  2. 2.0.31 × 1.5 — where does the decimal point go? (a) 0.0465 (b) 4.65 (c) 0.465 (d) 0.00465
  3. 3.6.8 × 1.8 — where does the decimal point go? (a) 122.4 (b) 0.1224 (c) 1.224 (d) 12.24
  4. 4.0.37 × 1.2 — where does the decimal point go? (a) 0.444 (b) 0.00444 (c) 4.44 (d) 0.0444
  5. 5.9.4 × 0.3 — where does the decimal point go? (a) 0.0282 (b) 2.82 (c) 0.282 (d) 28.2
  6. 6.2.4 × 31 — where does the decimal point go? (a) 74.4 (b) 744 (c) 0.744 (d) 7.44
  7. 7.2.6 × 21 — where does the decimal point go? (a) 54.6 (b) 546 (c) 0.546 (d) 5.46
  8. 8.0.21 × 0.2 — where does the decimal point go? (a) 0.0042 (b) 0.42 (c) 0.042 (d) 0.00042
  9. 9.0.77 × 7 — where does the decimal point go? (a) 53.9 (b) 0.539 (c) 0.0539 (d) 5.39
  10. 10.0.51 × 42 — where does the decimal point go? (a) 214.2 (b) 0.2142 (c) 2.142 (d) 21.42
  11. 11.5.2 × 0.3 — where does the decimal point go? (a) 15.6 (b) 0.156 (c) 0.0156 (d) 1.56
  12. 12.1.6 × 1.1 — where does the decimal point go? (a) 0.176 (b) 0.0176 (c) 1.76 (d) 17.6
  13. 13.0.38 × 4 — where does the decimal point go? (a) 1.52 (b) 0.152 (c) 15.2 (d) 0.0152
  14. 14.0.31 × 39 — where does the decimal point go? (a) 12.09 (b) 1.209 (c) 0.1209 (d) 120.9
  15. 15.2.7 × 0.3 — where does the decimal point go? (a) 0.81 (b) 8.1 (c) 0.0081 (d) 0.081
  16. 16.5.1 × 2.2 — where does the decimal point go? (a) 11.22 (b) 112.2 (c) 0.1122 (d) 1.122
  17. 17.2.9 × 0.4 — where does the decimal point go? (a) 0.116 (b) 0.0116 (c) 11.6 (d) 1.16
  18. 18.4.6 × 0.3 — where does the decimal point go? (a) 0.0138 (b) 1.38 (c) 13.8 (d) 0.138
  19. 19.0.25 × 1.3 — where does the decimal point go? (a) 0.325 (b) 0.0325 (c) 0.00325 (d) 3.25
  20. 20.0.78 × 3.7 — where does the decimal point go? (a) 28.86 (b) 2.886 (c) 0.02886 (d) 0.2886
  21. 21.0.85 × 1.1 — where does the decimal point go? (a) 0.0935 (b) 9.35 (c) 0.935 (d) 0.00935
  22. 22.0.56 × 46 — where does the decimal point go? (a) 25.76 (b) 2.576 (c) 257.6 (d) 0.2576
  23. 23.6.5 × 3.7 — where does the decimal point go? (a) 0.2405 (b) 24.05 (c) 2.405 (d) 240.5
  24. 24.0.79 × 2.7 — where does the decimal point go? (a) 21.33 (b) 0.2133 (c) 0.02133 (d) 2.133
  25. 25.0.46 × 4 — where does the decimal point go? (a) 1.84 (b) 0.0184 (c) 0.184 (d) 18.4
  26. 26.0.21 × 0.5 — where does the decimal point go? (a) 0.105 (b) 1.05 (c) 0.0105 (d) 0.00105
  27. 27.2.7 × 46 — where does the decimal point go? (a) 12.42 (b) 1.242 (c) 1242 (d) 124.2
  28. 28.0.43 × 4.6 — where does the decimal point go? (a) 19.78 (b) 1.978 (c) 0.1978 (d) 0.01978
  29. 29.4.3 × 0.4 — where does the decimal point go? (a) 1.72 (b) 0.172 (c) 17.2 (d) 0.0172
  30. 30.5.8 × 4 — where does the decimal point go? (a) 232 (b) 2.32 (c) 0.232 (d) 23.2
  31. 31.0.81 × 2.7 — where does the decimal point go? (a) 2.187 (b) 0.02187 (c) 21.87 (d) 0.2187
  32. 32.0.29 × 17 — where does the decimal point go? (a) 0.0493 (b) 4.93 (c) 49.3 (d) 0.493
  33. 33.6.4 × 18 — where does the decimal point go? (a) 1.152 (b) 115.2 (c) 1152 (d) 11.52
  34. 34.4.6 × 3.7 — where does the decimal point go? (a) 170.2 (b) 0.1702 (c) 1.702 (d) 17.02
  35. 35.6.3 × 1.8 — where does the decimal point go? (a) 1.134 (b) 0.1134 (c) 11.34 (d) 113.4
  36. 36.0.49 × 12 — where does the decimal point go? (a) 5.88 (b) 0.588 (c) 0.0588 (d) 58.8
  37. 37.0.77 × 4.5 — where does the decimal point go? (a) 0.3465 (b) 3.465 (c) 0.03465 (d) 34.65
  38. 38.4.2 × 36 — where does the decimal point go? (a) 151.2 (b) 1512 (c) 15.12 (d) 1.512
  39. 39.3.9 × 5 — where does the decimal point go? (a) 0.195 (b) 1.95 (c) 19.5 (d) 195
  40. 40.2.9 × 0.7 — where does the decimal point go? (a) 0.203 (b) 2.03 (c) 20.3 (d) 0.0203

Answer key

  1. 6.3
  2. 0.465
  3. 12.24
  4. 0.444
  5. 2.82
  6. 74.4
  7. 54.6
  8. 0.042
  9. 5.39
  10. 21.42
  11. 1.56
  12. 1.76
  13. 1.52
  14. 12.09
  15. 0.81
  16. 11.22
  17. 1.16
  18. 1.38
  19. 0.325
  20. 2.886
  21. 0.935
  22. 25.76
  23. 24.05
  24. 2.133
  25. 1.84
  26. 0.105
  27. 124.2
  28. 1.978
  29. 1.72
  30. 23.2
  31. 2.187
  32. 4.93
  33. 115.2
  34. 17.02
  35. 11.34
  36. 5.88
  37. 3.465
  38. 151.2
  39. 19.5
  40. 2.03

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