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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 861 · 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. 1.8.5 × 5 — where does the decimal point go? (a) 4.25 (b) 425 (c) 42.5 (d) 0.425
  2. 2.8.1 × 4.5 — where does the decimal point go? (a) 0.3645 (b) 36.45 (c) 3.645 (d) 364.5
  3. 3.2.3 × 0.7 — where does the decimal point go? (a) 0.161 (b) 0.0161 (c) 1.61 (d) 16.1
  4. 4.8.7 × 2 — where does the decimal point go? (a) 1.74 (b) 0.174 (c) 17.4 (d) 174
  5. 5.8.3 × 5 — where does the decimal point go? (a) 415 (b) 4.15 (c) 0.415 (d) 41.5
  6. 6.0.85 × 5 — where does the decimal point go? (a) 42.5 (b) 0.425 (c) 0.0425 (d) 4.25
  7. 7.0.25 × 3.7 — where does the decimal point go? (a) 0.925 (b) 0.0925 (c) 9.25 (d) 0.00925
  8. 8.0.97 × 0.3 — where does the decimal point go? (a) 0.0291 (b) 0.291 (c) 0.00291 (d) 2.91
  9. 9.9.3 × 19 — where does the decimal point go? (a) 1.767 (b) 176.7 (c) 1767 (d) 17.67
  10. 10.0.96 × 0.9 — where does the decimal point go? (a) 0.864 (b) 0.0864 (c) 0.00864 (d) 8.64
  11. 11.0.65 × 3 — where does the decimal point go? (a) 19.5 (b) 0.0195 (c) 0.195 (d) 1.95
  12. 12.0.22 × 0.2 — where does the decimal point go? (a) 0.44 (b) 0.00044 (c) 0.044 (d) 0.0044
  13. 13.0.94 × 9 — where does the decimal point go? (a) 0.846 (b) 0.0846 (c) 8.46 (d) 84.6
  14. 14.7.5 × 0.9 — where does the decimal point go? (a) 0.0675 (b) 6.75 (c) 67.5 (d) 0.675
  15. 15.3.9 × 8 — where does the decimal point go? (a) 312 (b) 3.12 (c) 0.312 (d) 31.2
  16. 16.9.9 × 1.8 — where does the decimal point go? (a) 0.1782 (b) 17.82 (c) 1.782 (d) 178.2
  17. 17.0.91 × 2 — where does the decimal point go? (a) 0.0182 (b) 1.82 (c) 0.182 (d) 18.2
  18. 18.9.1 × 1.1 — where does the decimal point go? (a) 100.1 (b) 10.01 (c) 0.1001 (d) 1.001
  19. 19.7.1 × 2 — where does the decimal point go? (a) 0.142 (b) 14.2 (c) 142 (d) 1.42
  20. 20.2.7 × 0.3 — where does the decimal point go? (a) 0.081 (b) 0.0081 (c) 0.81 (d) 8.1
  21. 21.7.4 × 14 — where does the decimal point go? (a) 10.36 (b) 1036 (c) 103.6 (d) 1.036
  22. 22.5.1 × 2.6 — where does the decimal point go? (a) 13.26 (b) 132.6 (c) 0.1326 (d) 1.326
  23. 23.5.2 × 21 — where does the decimal point go? (a) 1092 (b) 109.2 (c) 1.092 (d) 10.92
  24. 24.9.9 × 6 — where does the decimal point go? (a) 594 (b) 5.94 (c) 0.594 (d) 59.4
  25. 25.1.3 × 4.6 — where does the decimal point go? (a) 5.98 (b) 0.598 (c) 0.0598 (d) 59.8
  26. 26.6.3 × 21 — where does the decimal point go? (a) 13.23 (b) 1.323 (c) 1323 (d) 132.3
  27. 27.0.94 × 37 — where does the decimal point go? (a) 0.3478 (b) 34.78 (c) 3.478 (d) 347.8
  28. 28.0.94 × 17 — where does the decimal point go? (a) 0.1598 (b) 159.8 (c) 1.598 (d) 15.98
  29. 29.8.7 × 46 — where does the decimal point go? (a) 4002 (b) 40.02 (c) 4.002 (d) 400.2
  30. 30.2.4 × 0.2 — where does the decimal point go? (a) 0.048 (b) 0.48 (c) 4.8 (d) 0.0048
  31. 31.3.5 × 0.5 — where does the decimal point go? (a) 0.0175 (b) 1.75 (c) 0.175 (d) 17.5
  32. 32.8.4 × 21 — where does the decimal point go? (a) 17.64 (b) 176.4 (c) 1764 (d) 1.764
  33. 33.0.63 × 0.2 — where does the decimal point go? (a) 1.26 (b) 0.00126 (c) 0.126 (d) 0.0126
  34. 34.6.4 × 7 — where does the decimal point go? (a) 0.448 (b) 44.8 (c) 4.48 (d) 448
  35. 35.6.6 × 18 — where does the decimal point go? (a) 118.8 (b) 11.88 (c) 1.188 (d) 1188
  36. 36.0.44 × 2 — where does the decimal point go? (a) 8.8 (b) 0.088 (c) 0.88 (d) 0.0088
  37. 37.0.67 × 7 — where does the decimal point go? (a) 0.469 (b) 4.69 (c) 46.9 (d) 0.0469
  38. 38.0.31 × 39 — where does the decimal point go? (a) 120.9 (b) 1.209 (c) 12.09 (d) 0.1209
  39. 39.4.4 × 8 — where does the decimal point go? (a) 352 (b) 0.352 (c) 3.52 (d) 35.2
  40. 40.4.3 × 1.5 — where does the decimal point go? (a) 64.5 (b) 6.45 (c) 0.645 (d) 0.0645

Answer key

  1. 42.5
  2. 36.45
  3. 1.61
  4. 17.4
  5. 41.5
  6. 4.25
  7. 0.925
  8. 0.291
  9. 176.7
  10. 0.864
  11. 1.95
  12. 0.044
  13. 8.46
  14. 6.75
  15. 31.2
  16. 17.82
  17. 1.82
  18. 10.01
  19. 14.2
  20. 0.81
  21. 103.6
  22. 13.26
  23. 109.2
  24. 59.4
  25. 5.98
  26. 132.3
  27. 34.78
  28. 15.98
  29. 400.2
  30. 0.48
  31. 1.75
  32. 176.4
  33. 0.126
  34. 44.8
  35. 118.8
  36. 0.88
  37. 4.69
  38. 12.09
  39. 35.2
  40. 6.45

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