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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 217 · 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. 1.2.7 × 0.3 — where does the decimal point go? (a) 8.1 (b) 0.81 (c) 0.0081 (d) 0.081
  2. 2.0.14 × 3.8 — where does the decimal point go? (a) 5.32 (b) 0.00532 (c) 0.532 (d) 0.0532
  3. 3.0.53 × 6 — where does the decimal point go? (a) 0.318 (b) 31.8 (c) 3.18 (d) 0.0318
  4. 4.5.9 × 4.3 — where does the decimal point go? (a) 0.2537 (b) 2.537 (c) 253.7 (d) 25.37
  5. 5.1.9 × 0.6 — where does the decimal point go? (a) 11.4 (b) 0.0114 (c) 0.114 (d) 1.14
  6. 6.1.7 × 38 — where does the decimal point go? (a) 64.6 (b) 6.46 (c) 646 (d) 0.646
  7. 7.0.37 × 31 — where does the decimal point go? (a) 114.7 (b) 11.47 (c) 1.147 (d) 0.1147
  8. 8.1.4 × 49 — where does the decimal point go? (a) 68.6 (b) 686 (c) 6.86 (d) 0.686
  9. 9.0.39 × 0.9 — where does the decimal point go? (a) 0.0351 (b) 3.51 (c) 0.00351 (d) 0.351
  10. 10.0.14 × 2 — where does the decimal point go? (a) 0.028 (b) 0.28 (c) 0.0028 (d) 2.8
  11. 11.9.3 × 0.4 — where does the decimal point go? (a) 0.0372 (b) 37.2 (c) 0.372 (d) 3.72
  12. 12.8.1 × 6 — where does the decimal point go? (a) 48.6 (b) 486 (c) 4.86 (d) 0.486
  13. 13.0.92 × 22 — where does the decimal point go? (a) 202.4 (b) 2.024 (c) 20.24 (d) 0.2024
  14. 14.7.6 × 1.3 — where does the decimal point go? (a) 9.88 (b) 0.0988 (c) 0.988 (d) 98.8
  15. 15.0.19 × 9 — where does the decimal point go? (a) 0.171 (b) 17.1 (c) 1.71 (d) 0.0171
  16. 16.5.6 × 3.9 — where does the decimal point go? (a) 218.4 (b) 21.84 (c) 2.184 (d) 0.2184
  17. 17.3.3 × 4.1 — where does the decimal point go? (a) 13.53 (b) 1.353 (c) 0.1353 (d) 135.3
  18. 18.2.7 × 6 — where does the decimal point go? (a) 162 (b) 0.162 (c) 1.62 (d) 16.2
  19. 19.5.4 × 24 — where does the decimal point go? (a) 12.96 (b) 1296 (c) 129.6 (d) 1.296
  20. 20.6.1 × 1.3 — where does the decimal point go? (a) 79.3 (b) 0.0793 (c) 7.93 (d) 0.793
  21. 21.8.7 × 39 — where does the decimal point go? (a) 3.393 (b) 339.3 (c) 33.93 (d) 3393
  22. 22.0.86 × 2.8 — where does the decimal point go? (a) 0.2408 (b) 24.08 (c) 0.02408 (d) 2.408
  23. 23.2.1 × 1.2 — where does the decimal point go? (a) 0.252 (b) 25.2 (c) 2.52 (d) 0.0252
  24. 24.0.56 × 49 — where does the decimal point go? (a) 274.4 (b) 0.2744 (c) 2.744 (d) 27.44
  25. 25.0.63 × 0.4 — where does the decimal point go? (a) 0.00252 (b) 0.252 (c) 0.0252 (d) 2.52
  26. 26.0.72 × 8 — where does the decimal point go? (a) 5.76 (b) 57.6 (c) 0.576 (d) 0.0576
  27. 27.4.4 × 0.6 — where does the decimal point go? (a) 2.64 (b) 0.0264 (c) 0.264 (d) 26.4
  28. 28.0.92 × 0.6 — where does the decimal point go? (a) 0.552 (b) 0.0552 (c) 5.52 (d) 0.00552
  29. 29.3.3 × 5 — where does the decimal point go? (a) 0.165 (b) 1.65 (c) 165 (d) 16.5
  30. 30.2.9 × 11 — where does the decimal point go? (a) 319 (b) 31.9 (c) 0.319 (d) 3.19
  31. 31.1.9 × 8 — where does the decimal point go? (a) 15.2 (b) 152 (c) 0.152 (d) 1.52
  32. 32.0.39 × 14 — where does the decimal point go? (a) 54.6 (b) 5.46 (c) 0.546 (d) 0.0546
  33. 33.6.6 × 44 — where does the decimal point go? (a) 29.04 (b) 2.904 (c) 2904 (d) 290.4
  34. 34.1.9 × 0.9 — where does the decimal point go? (a) 0.0171 (b) 0.171 (c) 17.1 (d) 1.71
  35. 35.0.87 × 46 — where does the decimal point go? (a) 0.4002 (b) 4.002 (c) 400.2 (d) 40.02
  36. 36.2.7 × 4 — where does the decimal point go? (a) 10.8 (b) 1.08 (c) 0.108 (d) 108
  37. 37.5.6 × 3 — where does the decimal point go? (a) 0.168 (b) 1.68 (c) 16.8 (d) 168
  38. 38.0.36 × 3.2 — where does the decimal point go? (a) 11.52 (b) 0.01152 (c) 1.152 (d) 0.1152
  39. 39.0.84 × 0.2 — where does the decimal point go? (a) 0.0168 (b) 0.00168 (c) 0.168 (d) 1.68
  40. 40.0.62 × 3 — where does the decimal point go? (a) 1.86 (b) 0.186 (c) 0.0186 (d) 18.6

Answer key

  1. 0.81
  2. 0.532
  3. 3.18
  4. 25.37
  5. 1.14
  6. 64.6
  7. 11.47
  8. 68.6
  9. 0.351
  10. 0.28
  11. 3.72
  12. 48.6
  13. 20.24
  14. 9.88
  15. 1.71
  16. 21.84
  17. 13.53
  18. 16.2
  19. 129.6
  20. 7.93
  21. 339.3
  22. 2.408
  23. 2.52
  24. 27.44
  25. 0.252
  26. 5.76
  27. 2.64
  28. 0.552
  29. 16.5
  30. 31.9
  31. 15.2
  32. 5.46
  33. 290.4
  34. 1.71
  35. 40.02
  36. 10.8
  37. 16.8
  38. 1.152
  39. 0.168
  40. 1.86

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