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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 332 · 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. 1.0.81 × 45 — where does the decimal point go? (a) 364.5 (b) 36.45 (c) 0.3645 (d) 3.645
  2. 2.0.94 × 9 — where does the decimal point go? (a) 0.846 (b) 0.0846 (c) 84.6 (d) 8.46
  3. 3.3.7 × 7 — where does the decimal point go? (a) 2.59 (b) 259 (c) 0.259 (d) 25.9
  4. 4.3.2 × 4 — where does the decimal point go? (a) 128 (b) 0.128 (c) 12.8 (d) 1.28
  5. 5.0.34 × 3.2 — where does the decimal point go? (a) 0.01088 (b) 1.088 (c) 10.88 (d) 0.1088
  6. 6.5.4 × 33 — where does the decimal point go? (a) 178.2 (b) 17.82 (c) 1782 (d) 1.782
  7. 7.1.8 × 0.2 — where does the decimal point go? (a) 0.36 (b) 0.0036 (c) 0.036 (d) 3.6
  8. 8.0.64 × 6 — where does the decimal point go? (a) 0.384 (b) 0.0384 (c) 3.84 (d) 38.4
  9. 9.1.2 × 1.6 — where does the decimal point go? (a) 19.2 (b) 0.0192 (c) 0.192 (d) 1.92
  10. 10.0.22 × 7 — where does the decimal point go? (a) 0.154 (b) 15.4 (c) 0.0154 (d) 1.54
  11. 11.0.85 × 1.1 — where does the decimal point go? (a) 0.0935 (b) 0.00935 (c) 0.935 (d) 9.35
  12. 12.4.4 × 0.9 — where does the decimal point go? (a) 39.6 (b) 3.96 (c) 0.0396 (d) 0.396
  13. 13.2.7 × 0.7 — where does the decimal point go? (a) 0.189 (b) 18.9 (c) 0.0189 (d) 1.89
  14. 14.0.36 × 21 — where does the decimal point go? (a) 7.56 (b) 0.0756 (c) 0.756 (d) 75.6
  15. 15.4.1 × 15 — where does the decimal point go? (a) 0.615 (b) 6.15 (c) 61.5 (d) 615
  16. 16.5.2 × 14 — where does the decimal point go? (a) 7.28 (b) 728 (c) 0.728 (d) 72.8
  17. 17.9.8 × 0.9 — where does the decimal point go? (a) 88.2 (b) 0.0882 (c) 0.882 (d) 8.82
  18. 18.8.7 × 3 — where does the decimal point go? (a) 2.61 (b) 261 (c) 26.1 (d) 0.261
  19. 19.4.3 × 49 — where does the decimal point go? (a) 2.107 (b) 210.7 (c) 21.07 (d) 2107
  20. 20.0.19 × 0.8 — where does the decimal point go? (a) 0.0152 (b) 0.00152 (c) 1.52 (d) 0.152
  21. 21.0.58 × 37 — where does the decimal point go? (a) 0.2146 (b) 2.146 (c) 21.46 (d) 214.6
  22. 22.0.49 × 4.8 — where does the decimal point go? (a) 2.352 (b) 23.52 (c) 0.02352 (d) 0.2352
  23. 23.0.61 × 2.9 — where does the decimal point go? (a) 0.1769 (b) 1.769 (c) 0.01769 (d) 17.69
  24. 24.7.9 × 33 — where does the decimal point go? (a) 260.7 (b) 26.07 (c) 2607 (d) 2.607
  25. 25.0.77 × 3.4 — where does the decimal point go? (a) 0.2618 (b) 0.02618 (c) 26.18 (d) 2.618
  26. 26.4.9 × 21 — where does the decimal point go? (a) 102.9 (b) 1029 (c) 10.29 (d) 1.029
  27. 27.2.9 × 0.2 — where does the decimal point go? (a) 0.58 (b) 5.8 (c) 0.0058 (d) 0.058
  28. 28.2.4 × 47 — where does the decimal point go? (a) 1128 (b) 11.28 (c) 1.128 (d) 112.8
  29. 29.4.3 × 14 — where does the decimal point go? (a) 6.02 (b) 0.602 (c) 602 (d) 60.2
  30. 30.8.2 × 6 — where does the decimal point go? (a) 0.492 (b) 492 (c) 4.92 (d) 49.2
  31. 31.0.16 × 2 — where does the decimal point go? (a) 0.032 (b) 0.0032 (c) 3.2 (d) 0.32
  32. 32.6.6 × 6 — where does the decimal point go? (a) 0.396 (b) 39.6 (c) 396 (d) 3.96
  33. 33.0.13 × 3 — where does the decimal point go? (a) 3.9 (b) 0.0039 (c) 0.039 (d) 0.39
  34. 34.1.3 × 44 — where does the decimal point go? (a) 57.2 (b) 572 (c) 0.572 (d) 5.72
  35. 35.4.2 × 2 — where does the decimal point go? (a) 84 (b) 8.4 (c) 0.84 (d) 0.084
  36. 36.0.22 × 41 — where does the decimal point go? (a) 0.0902 (b) 0.902 (c) 9.02 (d) 90.2
  37. 37.1.6 × 31 — where does the decimal point go? (a) 49.6 (b) 0.496 (c) 496 (d) 4.96
  38. 38.0.99 × 5 — where does the decimal point go? (a) 4.95 (b) 49.5 (c) 0.495 (d) 0.0495
  39. 39.5.4 × 0.2 — where does the decimal point go? (a) 1.08 (b) 0.108 (c) 0.0108 (d) 10.8
  40. 40.2.7 × 4.8 — where does the decimal point go? (a) 12.96 (b) 129.6 (c) 0.1296 (d) 1.296

Answer key

  1. 36.45
  2. 8.46
  3. 25.9
  4. 12.8
  5. 1.088
  6. 178.2
  7. 0.36
  8. 3.84
  9. 1.92
  10. 1.54
  11. 0.935
  12. 3.96
  13. 1.89
  14. 7.56
  15. 61.5
  16. 72.8
  17. 8.82
  18. 26.1
  19. 210.7
  20. 0.152
  21. 21.46
  22. 2.352
  23. 1.769
  24. 260.7
  25. 2.618
  26. 102.9
  27. 0.58
  28. 112.8
  29. 60.2
  30. 49.2
  31. 0.32
  32. 39.6
  33. 0.39
  34. 57.2
  35. 8.4
  36. 9.02
  37. 49.6
  38. 4.95
  39. 1.08
  40. 12.96

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