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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 469 · 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. 1.0.65 × 27 — where does the decimal point go? (a) 1.755 (b) 17.55 (c) 175.5 (d) 0.1755
  2. 2.0.51 × 1.3 — where does the decimal point go? (a) 0.00663 (b) 6.63 (c) 0.0663 (d) 0.663
  3. 3.0.64 × 0.7 — where does the decimal point go? (a) 4.48 (b) 0.448 (c) 0.00448 (d) 0.0448
  4. 4.0.65 × 9 — where does the decimal point go? (a) 58.5 (b) 0.0585 (c) 5.85 (d) 0.585
  5. 5.5.8 × 0.8 — where does the decimal point go? (a) 46.4 (b) 0.0464 (c) 0.464 (d) 4.64
  6. 6.0.84 × 3 — where does the decimal point go? (a) 2.52 (b) 0.252 (c) 0.0252 (d) 25.2
  7. 7.7.9 × 2 — where does the decimal point go? (a) 15.8 (b) 0.158 (c) 158 (d) 1.58
  8. 8.1.9 × 6 — where does the decimal point go? (a) 11.4 (b) 114 (c) 1.14 (d) 0.114
  9. 9.0.97 × 7 — where does the decimal point go? (a) 6.79 (b) 0.679 (c) 0.0679 (d) 67.9
  10. 10.0.42 × 3 — where does the decimal point go? (a) 1.26 (b) 12.6 (c) 0.126 (d) 0.0126
  11. 11.9.2 × 12 — where does the decimal point go? (a) 1104 (b) 110.4 (c) 1.104 (d) 11.04
  12. 12.2.1 × 8 — where does the decimal point go? (a) 0.168 (b) 16.8 (c) 1.68 (d) 168
  13. 13.0.79 × 7 — where does the decimal point go? (a) 0.553 (b) 0.0553 (c) 5.53 (d) 55.3
  14. 14.0.73 × 49 — where does the decimal point go? (a) 35.77 (b) 357.7 (c) 3.577 (d) 0.3577
  15. 15.3.7 × 0.4 — where does the decimal point go? (a) 14.8 (b) 1.48 (c) 0.148 (d) 0.0148
  16. 16.5.4 × 16 — where does the decimal point go? (a) 864 (b) 0.864 (c) 8.64 (d) 86.4
  17. 17.8.9 × 9 — where does the decimal point go? (a) 8.01 (b) 0.801 (c) 801 (d) 80.1
  18. 18.2.1 × 0.3 — where does the decimal point go? (a) 0.63 (b) 6.3 (c) 0.0063 (d) 0.063
  19. 19.4.2 × 0.3 — where does the decimal point go? (a) 0.0126 (b) 0.126 (c) 12.6 (d) 1.26
  20. 20.7.1 × 0.2 — where does the decimal point go? (a) 1.42 (b) 0.142 (c) 0.0142 (d) 14.2
  21. 21.0.23 × 2.8 — where does the decimal point go? (a) 6.44 (b) 0.00644 (c) 0.0644 (d) 0.644
  22. 22.0.71 × 29 — where does the decimal point go? (a) 20.59 (b) 2.059 (c) 205.9 (d) 0.2059
  23. 23.2.8 × 4 — where does the decimal point go? (a) 11.2 (b) 0.112 (c) 1.12 (d) 112
  24. 24.0.48 × 4.3 — where does the decimal point go? (a) 20.64 (b) 2.064 (c) 0.2064 (d) 0.02064
  25. 25.0.68 × 29 — where does the decimal point go? (a) 0.1972 (b) 1.972 (c) 197.2 (d) 19.72
  26. 26.1.8 × 39 — where does the decimal point go? (a) 702 (b) 7.02 (c) 70.2 (d) 0.702
  27. 27.1.9 × 15 — where does the decimal point go? (a) 28.5 (b) 285 (c) 2.85 (d) 0.285
  28. 28.0.28 × 0.2 — where does the decimal point go? (a) 0.56 (b) 0.0056 (c) 0.056 (d) 0.00056
  29. 29.6.1 × 4 — where does the decimal point go? (a) 244 (b) 0.244 (c) 2.44 (d) 24.4
  30. 30.0.87 × 9 — where does the decimal point go? (a) 0.0783 (b) 0.783 (c) 78.3 (d) 7.83
  31. 31.2.8 × 1.4 — where does the decimal point go? (a) 0.392 (b) 0.0392 (c) 39.2 (d) 3.92
  32. 32.6.7 × 37 — where does the decimal point go? (a) 247.9 (b) 2479 (c) 2.479 (d) 24.79
  33. 33.0.43 × 0.7 — where does the decimal point go? (a) 0.00301 (b) 0.0301 (c) 3.01 (d) 0.301
  34. 34.4.2 × 0.9 — where does the decimal point go? (a) 0.378 (b) 0.0378 (c) 37.8 (d) 3.78
  35. 35.9.4 × 0.2 — where does the decimal point go? (a) 18.8 (b) 0.0188 (c) 0.188 (d) 1.88
  36. 36.9.6 × 7 — where does the decimal point go? (a) 0.672 (b) 672 (c) 67.2 (d) 6.72
  37. 37.0.38 × 43 — where does the decimal point go? (a) 1.634 (b) 0.1634 (c) 163.4 (d) 16.34
  38. 38.0.53 × 2.8 — where does the decimal point go? (a) 0.1484 (b) 1.484 (c) 0.01484 (d) 14.84
  39. 39.4.4 × 3 — where does the decimal point go? (a) 0.132 (b) 132 (c) 1.32 (d) 13.2
  40. 40.0.26 × 0.6 — where does the decimal point go? (a) 0.156 (b) 0.00156 (c) 0.0156 (d) 1.56

Answer key

  1. 17.55
  2. 0.663
  3. 0.448
  4. 5.85
  5. 4.64
  6. 2.52
  7. 15.8
  8. 11.4
  9. 6.79
  10. 1.26
  11. 110.4
  12. 16.8
  13. 5.53
  14. 35.77
  15. 1.48
  16. 86.4
  17. 80.1
  18. 0.63
  19. 1.26
  20. 1.42
  21. 0.644
  22. 20.59
  23. 11.2
  24. 2.064
  25. 19.72
  26. 70.2
  27. 28.5
  28. 0.056
  29. 24.4
  30. 7.83
  31. 3.92
  32. 247.9
  33. 0.301
  34. 3.78
  35. 1.88
  36. 67.2
  37. 16.34
  38. 1.484
  39. 13.2
  40. 0.156

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