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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 745 · 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. 1.7.1 × 5 — where does the decimal point go? (a) 0.355 (b) 35.5 (c) 355 (d) 3.55
  2. 2.0.42 × 2 — where does the decimal point go? (a) 0.0084 (b) 0.84 (c) 8.4 (d) 0.084
  3. 3.0.69 × 6 — where does the decimal point go? (a) 0.414 (b) 0.0414 (c) 4.14 (d) 41.4
  4. 4.9.1 × 0.7 — where does the decimal point go? (a) 6.37 (b) 0.0637 (c) 0.637 (d) 63.7
  5. 5.1.3 × 0.8 — where does the decimal point go? (a) 1.04 (b) 10.4 (c) 0.0104 (d) 0.104
  6. 6.4.1 × 29 — where does the decimal point go? (a) 1.189 (b) 11.89 (c) 118.9 (d) 1189
  7. 7.1.5 × 9 — where does the decimal point go? (a) 0.135 (b) 13.5 (c) 1.35 (d) 135
  8. 8.0.55 × 9 — where does the decimal point go? (a) 49.5 (b) 0.495 (c) 0.0495 (d) 4.95
  9. 9.8.9 × 4.8 — where does the decimal point go? (a) 0.4272 (b) 42.72 (c) 427.2 (d) 4.272
  10. 10.0.18 × 0.7 — where does the decimal point go? (a) 0.126 (b) 0.0126 (c) 1.26 (d) 0.00126
  11. 11.3.4 × 7 — where does the decimal point go? (a) 2.38 (b) 23.8 (c) 0.238 (d) 238
  12. 12.0.37 × 4.2 — where does the decimal point go? (a) 1.554 (b) 0.1554 (c) 0.01554 (d) 15.54
  13. 13.0.12 × 3 — where does the decimal point go? (a) 0.036 (b) 3.6 (c) 0.36 (d) 0.0036
  14. 14.1.2 × 4.2 — where does the decimal point go? (a) 0.0504 (b) 0.504 (c) 5.04 (d) 50.4
  15. 15.0.33 × 0.3 — where does the decimal point go? (a) 0.0099 (b) 0.099 (c) 0.00099 (d) 0.99
  16. 16.2.3 × 0.3 — where does the decimal point go? (a) 6.9 (b) 0.69 (c) 0.0069 (d) 0.069
  17. 17.6.6 × 0.9 — where does the decimal point go? (a) 0.0594 (b) 5.94 (c) 59.4 (d) 0.594
  18. 18.0.23 × 12 — where does the decimal point go? (a) 0.276 (b) 2.76 (c) 0.0276 (d) 27.6
  19. 19.7.6 × 2 — where does the decimal point go? (a) 0.152 (b) 1.52 (c) 152 (d) 15.2
  20. 20.8.3 × 46 — where does the decimal point go? (a) 381.8 (b) 3.818 (c) 3818 (d) 38.18
  21. 21.0.25 × 4.1 — where does the decimal point go? (a) 1.025 (b) 0.1025 (c) 0.01025 (d) 10.25
  22. 22.0.58 × 1.3 — where does the decimal point go? (a) 0.754 (b) 0.0754 (c) 0.00754 (d) 7.54
  23. 23.0.56 × 3 — where does the decimal point go? (a) 1.68 (b) 0.0168 (c) 0.168 (d) 16.8
  24. 24.9.8 × 37 — where does the decimal point go? (a) 362.6 (b) 36.26 (c) 3.626 (d) 3626
  25. 25.0.19 × 7 — where does the decimal point go? (a) 0.133 (b) 1.33 (c) 0.0133 (d) 13.3
  26. 26.0.93 × 4 — where does the decimal point go? (a) 0.372 (b) 0.0372 (c) 37.2 (d) 3.72
  27. 27.1.3 × 23 — where does the decimal point go? (a) 2.99 (b) 0.299 (c) 29.9 (d) 299
  28. 28.0.28 × 3 — where does the decimal point go? (a) 0.84 (b) 0.0084 (c) 0.084 (d) 8.4
  29. 29.4.6 × 3.9 — where does the decimal point go? (a) 17.94 (b) 179.4 (c) 1.794 (d) 0.1794
  30. 30.9.8 × 7 — where does the decimal point go? (a) 686 (b) 6.86 (c) 0.686 (d) 68.6
  31. 31.8.4 × 3.1 — where does the decimal point go? (a) 260.4 (b) 0.2604 (c) 2.604 (d) 26.04
  32. 32.0.52 × 28 — where does the decimal point go? (a) 1.456 (b) 0.1456 (c) 145.6 (d) 14.56
  33. 33.0.21 × 3.8 — where does the decimal point go? (a) 0.00798 (b) 0.798 (c) 0.0798 (d) 7.98
  34. 34.3.1 × 27 — where does the decimal point go? (a) 0.837 (b) 8.37 (c) 83.7 (d) 837
  35. 35.4.6 × 14 — where does the decimal point go? (a) 6.44 (b) 0.644 (c) 644 (d) 64.4
  36. 36.0.73 × 6 — where does the decimal point go? (a) 0.0438 (b) 0.438 (c) 4.38 (d) 43.8
  37. 37.0.81 × 0.4 — where does the decimal point go? (a) 0.324 (b) 0.00324 (c) 3.24 (d) 0.0324
  38. 38.0.78 × 2 — where does the decimal point go? (a) 1.56 (b) 15.6 (c) 0.156 (d) 0.0156
  39. 39.0.38 × 0.9 — where does the decimal point go? (a) 0.342 (b) 0.0342 (c) 0.00342 (d) 3.42
  40. 40.4.5 × 0.9 — where does the decimal point go? (a) 40.5 (b) 0.405 (c) 4.05 (d) 0.0405

Answer key

  1. 35.5
  2. 0.84
  3. 4.14
  4. 6.37
  5. 1.04
  6. 118.9
  7. 13.5
  8. 4.95
  9. 42.72
  10. 0.126
  11. 23.8
  12. 1.554
  13. 0.36
  14. 5.04
  15. 0.099
  16. 0.69
  17. 5.94
  18. 2.76
  19. 15.2
  20. 381.8
  21. 1.025
  22. 0.754
  23. 1.68
  24. 362.6
  25. 1.33
  26. 3.72
  27. 29.9
  28. 0.84
  29. 17.94
  30. 68.6
  31. 26.04
  32. 14.56
  33. 0.798
  34. 83.7
  35. 64.4
  36. 4.38
  37. 0.324
  38. 1.56
  39. 0.342
  40. 4.05

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