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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 379 · 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. 1.0.28 × 33 — where does the decimal point go? (a) 0.924 (b) 0.0924 (c) 9.24 (d) 92.4
  2. 2.0.31 × 6 — where does the decimal point go? (a) 0.0186 (b) 18.6 (c) 1.86 (d) 0.186
  3. 3.0.14 × 8 — where does the decimal point go? (a) 1.12 (b) 0.0112 (c) 11.2 (d) 0.112
  4. 4.0.29 × 3 — where does the decimal point go? (a) 0.87 (b) 0.087 (c) 0.0087 (d) 8.7
  5. 5.0.81 × 3.1 — where does the decimal point go? (a) 0.02511 (b) 25.11 (c) 0.2511 (d) 2.511
  6. 6.1.5 × 0.9 — where does the decimal point go? (a) 13.5 (b) 0.135 (c) 1.35 (d) 0.0135
  7. 7.0.53 × 39 — where does the decimal point go? (a) 206.7 (b) 20.67 (c) 2.067 (d) 0.2067
  8. 8.1.3 × 0.5 — where does the decimal point go? (a) 0.0065 (b) 6.5 (c) 0.065 (d) 0.65
  9. 9.0.29 × 0.3 — where does the decimal point go? (a) 0.087 (b) 0.87 (c) 0.0087 (d) 0.00087
  10. 10.7.8 × 32 — where does the decimal point go? (a) 2.496 (b) 249.6 (c) 24.96 (d) 2496
  11. 11.0.19 × 0.4 — where does the decimal point go? (a) 0.076 (b) 0.76 (c) 0.0076 (d) 0.00076
  12. 12.0.39 × 2.6 — where does the decimal point go? (a) 0.01014 (b) 10.14 (c) 0.1014 (d) 1.014
  13. 13.2.8 × 49 — where does the decimal point go? (a) 13.72 (b) 137.2 (c) 1.372 (d) 1372
  14. 14.7.5 × 45 — where does the decimal point go? (a) 33.75 (b) 337.5 (c) 3.375 (d) 3375
  15. 15.1.6 × 38 — where does the decimal point go? (a) 0.608 (b) 6.08 (c) 608 (d) 60.8
  16. 16.0.68 × 24 — where does the decimal point go? (a) 1.632 (b) 163.2 (c) 0.1632 (d) 16.32
  17. 17.5.4 × 0.4 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 0.0216 (d) 21.6
  18. 18.3.1 × 7 — where does the decimal point go? (a) 21.7 (b) 0.217 (c) 2.17 (d) 217
  19. 19.0.15 × 0.9 — where does the decimal point go? (a) 0.00135 (b) 0.135 (c) 1.35 (d) 0.0135
  20. 20.0.34 × 3 — where does the decimal point go? (a) 1.02 (b) 0.102 (c) 0.0102 (d) 10.2
  21. 21.6.3 × 5 — where does the decimal point go? (a) 0.315 (b) 3.15 (c) 31.5 (d) 315
  22. 22.2.1 × 45 — where does the decimal point go? (a) 945 (b) 94.5 (c) 0.945 (d) 9.45
  23. 23.3.6 × 23 — where does the decimal point go? (a) 0.828 (b) 8.28 (c) 828 (d) 82.8
  24. 24.1.7 × 21 — where does the decimal point go? (a) 35.7 (b) 3.57 (c) 357 (d) 0.357
  25. 25.0.45 × 0.7 — where does the decimal point go? (a) 0.00315 (b) 3.15 (c) 0.315 (d) 0.0315
  26. 26.1.7 × 7 — where does the decimal point go? (a) 1.19 (b) 11.9 (c) 119 (d) 0.119
  27. 27.4.3 × 4.3 — where does the decimal point go? (a) 18.49 (b) 184.9 (c) 0.1849 (d) 1.849
  28. 28.0.78 × 0.2 — where does the decimal point go? (a) 0.0156 (b) 0.00156 (c) 1.56 (d) 0.156
  29. 29.0.48 × 22 — where does the decimal point go? (a) 10.56 (b) 0.1056 (c) 1.056 (d) 105.6
  30. 30.6.9 × 46 — where does the decimal point go? (a) 317.4 (b) 31.74 (c) 3174 (d) 3.174
  31. 31.8.6 × 9 — where does the decimal point go? (a) 774 (b) 7.74 (c) 0.774 (d) 77.4
  32. 32.0.57 × 27 — where does the decimal point go? (a) 153.9 (b) 1.539 (c) 0.1539 (d) 15.39
  33. 33.0.39 × 0.8 — where does the decimal point go? (a) 3.12 (b) 0.312 (c) 0.00312 (d) 0.0312
  34. 34.8.9 × 0.9 — where does the decimal point go? (a) 8.01 (b) 80.1 (c) 0.0801 (d) 0.801
  35. 35.1.9 × 4.1 — where does the decimal point go? (a) 7.79 (b) 0.779 (c) 77.9 (d) 0.0779
  36. 36.2.5 × 7 — where does the decimal point go? (a) 0.175 (b) 175 (c) 17.5 (d) 1.75
  37. 37.0.61 × 22 — where does the decimal point go? (a) 13.42 (b) 0.1342 (c) 1.342 (d) 134.2
  38. 38.0.58 × 38 — where does the decimal point go? (a) 22.04 (b) 0.2204 (c) 220.4 (d) 2.204
  39. 39.9.8 × 2.1 — where does the decimal point go? (a) 2.058 (b) 20.58 (c) 0.2058 (d) 205.8
  40. 40.3.6 × 42 — where does the decimal point go? (a) 1512 (b) 1.512 (c) 151.2 (d) 15.12

Answer key

  1. 9.24
  2. 1.86
  3. 1.12
  4. 0.87
  5. 2.511
  6. 1.35
  7. 20.67
  8. 0.65
  9. 0.087
  10. 249.6
  11. 0.076
  12. 1.014
  13. 137.2
  14. 337.5
  15. 60.8
  16. 16.32
  17. 2.16
  18. 21.7
  19. 0.135
  20. 1.02
  21. 31.5
  22. 94.5
  23. 82.8
  24. 35.7
  25. 0.315
  26. 11.9
  27. 18.49
  28. 0.156
  29. 10.56
  30. 317.4
  31. 77.4
  32. 15.39
  33. 0.312
  34. 8.01
  35. 7.79
  36. 17.5
  37. 13.42
  38. 22.04
  39. 20.58
  40. 151.2

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