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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 514 · 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. 1.7.2 × 2 — where does the decimal point go? (a) 14.4 (b) 1.44 (c) 144 (d) 0.144
  2. 2.0.53 × 0.7 — where does the decimal point go? (a) 0.371 (b) 0.00371 (c) 0.0371 (d) 3.71
  3. 3.0.89 × 4.4 — where does the decimal point go? (a) 0.3916 (b) 39.16 (c) 3.916 (d) 0.03916
  4. 4.9.3 × 1.1 — where does the decimal point go? (a) 1.023 (b) 10.23 (c) 0.1023 (d) 102.3
  5. 5.6.8 × 3 — where does the decimal point go? (a) 0.204 (b) 204 (c) 20.4 (d) 2.04
  6. 6.4.5 × 9 — where does the decimal point go? (a) 0.405 (b) 40.5 (c) 405 (d) 4.05
  7. 7.6.6 × 3 — where does the decimal point go? (a) 19.8 (b) 1.98 (c) 198 (d) 0.198
  8. 8.0.19 × 2 — where does the decimal point go? (a) 0.0038 (b) 3.8 (c) 0.38 (d) 0.038
  9. 9.5.7 × 25 — where does the decimal point go? (a) 1.425 (b) 142.5 (c) 1425 (d) 14.25
  10. 10.9.6 × 23 — where does the decimal point go? (a) 2208 (b) 2.208 (c) 22.08 (d) 220.8
  11. 11.0.51 × 1.9 — where does the decimal point go? (a) 0.969 (b) 0.00969 (c) 9.69 (d) 0.0969
  12. 12.0.54 × 0.8 — where does the decimal point go? (a) 0.432 (b) 0.00432 (c) 4.32 (d) 0.0432
  13. 13.4.3 × 21 — where does the decimal point go? (a) 90.3 (b) 0.903 (c) 9.03 (d) 903
  14. 14.7.5 × 3 — where does the decimal point go? (a) 2.25 (b) 0.225 (c) 225 (d) 22.5
  15. 15.0.85 × 0.3 — where does the decimal point go? (a) 0.00255 (b) 0.255 (c) 0.0255 (d) 2.55
  16. 16.0.81 × 42 — where does the decimal point go? (a) 34.02 (b) 340.2 (c) 0.3402 (d) 3.402
  17. 17.8.4 × 26 — where does the decimal point go? (a) 21.84 (b) 2184 (c) 2.184 (d) 218.4
  18. 18.3.8 × 1.8 — where does the decimal point go? (a) 0.684 (b) 68.4 (c) 6.84 (d) 0.0684
  19. 19.9.7 × 4.3 — where does the decimal point go? (a) 41.71 (b) 417.1 (c) 4.171 (d) 0.4171
  20. 20.7.5 × 9 — where does the decimal point go? (a) 675 (b) 6.75 (c) 0.675 (d) 67.5
  21. 21.0.21 × 0.4 — where does the decimal point go? (a) 0.0084 (b) 0.084 (c) 0.00084 (d) 0.84
  22. 22.1.3 × 45 — where does the decimal point go? (a) 0.585 (b) 585 (c) 58.5 (d) 5.85
  23. 23.1.9 × 6 — where does the decimal point go? (a) 1.14 (b) 11.4 (c) 0.114 (d) 114
  24. 24.0.15 × 4.7 — where does the decimal point go? (a) 7.05 (b) 0.705 (c) 0.00705 (d) 0.0705
  25. 25.6.3 × 4.4 — where does the decimal point go? (a) 277.2 (b) 2.772 (c) 27.72 (d) 0.2772
  26. 26.7.1 × 7 — where does the decimal point go? (a) 4.97 (b) 497 (c) 49.7 (d) 0.497
  27. 27.0.97 × 3 — where does the decimal point go? (a) 0.0291 (b) 0.291 (c) 2.91 (d) 29.1
  28. 28.0.61 × 8 — where does the decimal point go? (a) 0.0488 (b) 4.88 (c) 0.488 (d) 48.8
  29. 29.2.3 × 3.9 — where does the decimal point go? (a) 0.897 (b) 8.97 (c) 89.7 (d) 0.0897
  30. 30.1.5 × 0.7 — where does the decimal point go? (a) 0.105 (b) 1.05 (c) 0.0105 (d) 10.5
  31. 31.3.7 × 3 — where does the decimal point go? (a) 11.1 (b) 0.111 (c) 1.11 (d) 111
  32. 32.7.1 × 24 — where does the decimal point go? (a) 17.04 (b) 170.4 (c) 1704 (d) 1.704
  33. 33.0.78 × 0.2 — where does the decimal point go? (a) 0.0156 (b) 1.56 (c) 0.00156 (d) 0.156
  34. 34.9.8 × 3 — where does the decimal point go? (a) 2.94 (b) 294 (c) 0.294 (d) 29.4
  35. 35.5.6 × 43 — where does the decimal point go? (a) 24.08 (b) 2408 (c) 2.408 (d) 240.8
  36. 36.2.2 × 31 — where does the decimal point go? (a) 6.82 (b) 682 (c) 0.682 (d) 68.2
  37. 37.5.7 × 2 — where does the decimal point go? (a) 1.14 (b) 11.4 (c) 0.114 (d) 114
  38. 38.5.7 × 0.5 — where does the decimal point go? (a) 2.85 (b) 0.285 (c) 0.0285 (d) 28.5
  39. 39.5.6 × 34 — where does the decimal point go? (a) 1.904 (b) 190.4 (c) 1904 (d) 19.04
  40. 40.4.6 × 32 — where does the decimal point go? (a) 14.72 (b) 1472 (c) 1.472 (d) 147.2

Answer key

  1. 14.4
  2. 0.371
  3. 3.916
  4. 10.23
  5. 20.4
  6. 40.5
  7. 19.8
  8. 0.38
  9. 142.5
  10. 220.8
  11. 0.969
  12. 0.432
  13. 90.3
  14. 22.5
  15. 0.255
  16. 34.02
  17. 218.4
  18. 6.84
  19. 41.71
  20. 67.5
  21. 0.084
  22. 58.5
  23. 11.4
  24. 0.705
  25. 27.72
  26. 49.7
  27. 2.91
  28. 4.88
  29. 8.97
  30. 1.05
  31. 11.1
  32. 170.4
  33. 0.156
  34. 29.4
  35. 240.8
  36. 68.2
  37. 11.4
  38. 2.85
  39. 190.4
  40. 147.2

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