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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 620 · 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. 1.4.4 × 0.4 — where does the decimal point go? (a) 0.0176 (b) 0.176 (c) 1.76 (d) 17.6
  2. 2.0.91 × 1.9 — where does the decimal point go? (a) 1.729 (b) 17.29 (c) 0.1729 (d) 0.01729
  3. 3.2.9 × 0.9 — where does the decimal point go? (a) 2.61 (b) 0.0261 (c) 0.261 (d) 26.1
  4. 4.0.36 × 0.4 — where does the decimal point go? (a) 0.0144 (b) 0.00144 (c) 0.144 (d) 1.44
  5. 5.0.59 × 7 — where does the decimal point go? (a) 0.413 (b) 0.0413 (c) 4.13 (d) 41.3
  6. 6.9.2 × 37 — where does the decimal point go? (a) 3404 (b) 340.4 (c) 3.404 (d) 34.04
  7. 7.0.91 × 8 — where does the decimal point go? (a) 7.28 (b) 0.728 (c) 72.8 (d) 0.0728
  8. 8.0.64 × 4.9 — where does the decimal point go? (a) 31.36 (b) 3.136 (c) 0.03136 (d) 0.3136
  9. 9.0.98 × 1.9 — where does the decimal point go? (a) 18.62 (b) 0.1862 (c) 1.862 (d) 0.01862
  10. 10.6.1 × 4.9 — where does the decimal point go? (a) 0.2989 (b) 29.89 (c) 2.989 (d) 298.9
  11. 11.0.65 × 1.7 — where does the decimal point go? (a) 1.105 (b) 0.1105 (c) 0.01105 (d) 11.05
  12. 12.8.7 × 2 — where does the decimal point go? (a) 17.4 (b) 174 (c) 1.74 (d) 0.174
  13. 13.1.7 × 6 — where does the decimal point go? (a) 10.2 (b) 102 (c) 1.02 (d) 0.102
  14. 14.0.12 × 0.2 — where does the decimal point go? (a) 0.24 (b) 0.0024 (c) 0.00024 (d) 0.024
  15. 15.5.7 × 3 — where does the decimal point go? (a) 1.71 (b) 17.1 (c) 171 (d) 0.171
  16. 16.1.4 × 3.1 — where does the decimal point go? (a) 4.34 (b) 0.0434 (c) 43.4 (d) 0.434
  17. 17.8.9 × 12 — where does the decimal point go? (a) 10.68 (b) 106.8 (c) 1068 (d) 1.068
  18. 18.4.7 × 9 — where does the decimal point go? (a) 42.3 (b) 4.23 (c) 0.423 (d) 423
  19. 19.0.92 × 7 — where does the decimal point go? (a) 0.644 (b) 0.0644 (c) 6.44 (d) 64.4
  20. 20.3.8 × 9 — where does the decimal point go? (a) 0.342 (b) 3.42 (c) 34.2 (d) 342
  21. 21.1.7 × 2.8 — where does the decimal point go? (a) 0.476 (b) 0.0476 (c) 47.6 (d) 4.76
  22. 22.9.1 × 1.8 — where does the decimal point go? (a) 0.1638 (b) 163.8 (c) 16.38 (d) 1.638
  23. 23.0.42 × 0.7 — where does the decimal point go? (a) 0.0294 (b) 0.294 (c) 2.94 (d) 0.00294
  24. 24.0.77 × 5 — where does the decimal point go? (a) 0.385 (b) 3.85 (c) 38.5 (d) 0.0385
  25. 25.8.5 × 0.9 — where does the decimal point go? (a) 7.65 (b) 0.765 (c) 76.5 (d) 0.0765
  26. 26.0.98 × 6 — where does the decimal point go? (a) 0.0588 (b) 5.88 (c) 58.8 (d) 0.588
  27. 27.1.9 × 4 — where does the decimal point go? (a) 7.6 (b) 0.76 (c) 0.076 (d) 76
  28. 28.9.4 × 3 — where does the decimal point go? (a) 282 (b) 28.2 (c) 2.82 (d) 0.282
  29. 29.2.1 × 0.3 — where does the decimal point go? (a) 6.3 (b) 0.063 (c) 0.63 (d) 0.0063
  30. 30.0.14 × 0.3 — where does the decimal point go? (a) 0.00042 (b) 0.042 (c) 0.0042 (d) 0.42
  31. 31.0.84 × 8 — where does the decimal point go? (a) 0.672 (b) 67.2 (c) 6.72 (d) 0.0672
  32. 32.3.7 × 7 — where does the decimal point go? (a) 259 (b) 25.9 (c) 2.59 (d) 0.259
  33. 33.1.9 × 46 — where does the decimal point go? (a) 8.74 (b) 0.874 (c) 87.4 (d) 874
  34. 34.0.59 × 0.2 — where does the decimal point go? (a) 0.00118 (b) 0.118 (c) 1.18 (d) 0.0118
  35. 35.0.77 × 15 — where does the decimal point go? (a) 0.1155 (b) 11.55 (c) 1.155 (d) 115.5
  36. 36.9.6 × 0.9 — where does the decimal point go? (a) 0.864 (b) 0.0864 (c) 86.4 (d) 8.64
  37. 37.3.8 × 8 — where does the decimal point go? (a) 0.304 (b) 30.4 (c) 3.04 (d) 304
  38. 38.0.41 × 7 — where does the decimal point go? (a) 0.287 (b) 2.87 (c) 28.7 (d) 0.0287
  39. 39.0.93 × 3 — where does the decimal point go? (a) 0.279 (b) 27.9 (c) 2.79 (d) 0.0279
  40. 40.3.2 × 0.3 — where does the decimal point go? (a) 0.96 (b) 0.0096 (c) 9.6 (d) 0.096

Answer key

  1. 1.76
  2. 1.729
  3. 2.61
  4. 0.144
  5. 4.13
  6. 340.4
  7. 7.28
  8. 3.136
  9. 1.862
  10. 29.89
  11. 1.105
  12. 17.4
  13. 10.2
  14. 0.024
  15. 17.1
  16. 4.34
  17. 106.8
  18. 42.3
  19. 6.44
  20. 34.2
  21. 4.76
  22. 16.38
  23. 0.294
  24. 3.85
  25. 7.65
  26. 5.88
  27. 7.6
  28. 28.2
  29. 0.63
  30. 0.042
  31. 6.72
  32. 25.9
  33. 87.4
  34. 0.118
  35. 11.55
  36. 8.64
  37. 30.4
  38. 2.87
  39. 2.79
  40. 0.96

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