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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 358 · 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. 1.0.19 × 2.2 — where does the decimal point go? (a) 0.418 (b) 0.0418 (c) 0.00418 (d) 4.18
  2. 2.7.8 × 0.8 — where does the decimal point go? (a) 0.624 (b) 0.0624 (c) 62.4 (d) 6.24
  3. 3.7.2 × 0.2 — where does the decimal point go? (a) 0.0144 (b) 14.4 (c) 1.44 (d) 0.144
  4. 4.0.68 × 4 — where does the decimal point go? (a) 27.2 (b) 2.72 (c) 0.272 (d) 0.0272
  5. 5.0.21 × 12 — where does the decimal point go? (a) 0.252 (b) 2.52 (c) 25.2 (d) 0.0252
  6. 6.8.8 × 3 — where does the decimal point go? (a) 2.64 (b) 26.4 (c) 0.264 (d) 264
  7. 7.4.2 × 32 — where does the decimal point go? (a) 1344 (b) 134.4 (c) 1.344 (d) 13.44
  8. 8.0.35 × 33 — where does the decimal point go? (a) 1.155 (b) 115.5 (c) 11.55 (d) 0.1155
  9. 9.0.95 × 5 — where does the decimal point go? (a) 4.75 (b) 0.0475 (c) 0.475 (d) 47.5
  10. 10.4.7 × 46 — where does the decimal point go? (a) 216.2 (b) 2162 (c) 2.162 (d) 21.62
  11. 11.0.71 × 0.9 — where does the decimal point go? (a) 0.00639 (b) 6.39 (c) 0.639 (d) 0.0639
  12. 12.8.7 × 1.9 — where does the decimal point go? (a) 165.3 (b) 16.53 (c) 0.1653 (d) 1.653
  13. 13.0.37 × 0.9 — where does the decimal point go? (a) 0.00333 (b) 3.33 (c) 0.333 (d) 0.0333
  14. 14.0.13 × 6 — where does the decimal point go? (a) 0.0078 (b) 7.8 (c) 0.078 (d) 0.78
  15. 15.0.36 × 0.4 — where does the decimal point go? (a) 0.0144 (b) 0.144 (c) 1.44 (d) 0.00144
  16. 16.0.71 × 0.2 — where does the decimal point go? (a) 0.00142 (b) 1.42 (c) 0.142 (d) 0.0142
  17. 17.0.37 × 0.2 — where does the decimal point go? (a) 0.0074 (b) 0.00074 (c) 0.074 (d) 0.74
  18. 18.3.3 × 33 — where does the decimal point go? (a) 1.089 (b) 108.9 (c) 10.89 (d) 1089
  19. 19.5.4 × 3.9 — where does the decimal point go? (a) 2.106 (b) 21.06 (c) 0.2106 (d) 210.6
  20. 20.0.68 × 0.4 — where does the decimal point go? (a) 2.72 (b) 0.272 (c) 0.00272 (d) 0.0272
  21. 21.6.5 × 7 — where does the decimal point go? (a) 0.455 (b) 455 (c) 45.5 (d) 4.55
  22. 22.6.1 × 0.3 — where does the decimal point go? (a) 18.3 (b) 0.183 (c) 1.83 (d) 0.0183
  23. 23.6.7 × 6 — where does the decimal point go? (a) 40.2 (b) 0.402 (c) 4.02 (d) 402
  24. 24.0.42 × 0.8 — where does the decimal point go? (a) 0.336 (b) 0.00336 (c) 0.0336 (d) 3.36
  25. 25.2.8 × 1.4 — where does the decimal point go? (a) 0.0392 (b) 39.2 (c) 0.392 (d) 3.92
  26. 26.7.5 × 7 — where does the decimal point go? (a) 0.525 (b) 5.25 (c) 52.5 (d) 525
  27. 27.4.9 × 4.4 — where does the decimal point go? (a) 0.2156 (b) 2.156 (c) 215.6 (d) 21.56
  28. 28.0.31 × 3.4 — where does the decimal point go? (a) 1.054 (b) 0.1054 (c) 0.01054 (d) 10.54
  29. 29.7.1 × 0.9 — where does the decimal point go? (a) 0.639 (b) 0.0639 (c) 63.9 (d) 6.39
  30. 30.0.77 × 24 — where does the decimal point go? (a) 184.8 (b) 0.1848 (c) 1.848 (d) 18.48
  31. 31.1.8 × 9 — where does the decimal point go? (a) 162 (b) 16.2 (c) 0.162 (d) 1.62
  32. 32.4.3 × 3.6 — where does the decimal point go? (a) 15.48 (b) 154.8 (c) 1.548 (d) 0.1548
  33. 33.1.2 × 8 — where does the decimal point go? (a) 9.6 (b) 0.96 (c) 0.096 (d) 96
  34. 34.3.5 × 23 — where does the decimal point go? (a) 0.805 (b) 8.05 (c) 80.5 (d) 805
  35. 35.0.77 × 47 — where does the decimal point go? (a) 3.619 (b) 0.3619 (c) 361.9 (d) 36.19
  36. 36.7.9 × 0.6 — where does the decimal point go? (a) 4.74 (b) 0.0474 (c) 0.474 (d) 47.4
  37. 37.0.49 × 0.7 — where does the decimal point go? (a) 0.0343 (b) 0.00343 (c) 3.43 (d) 0.343
  38. 38.0.91 × 0.3 — where does the decimal point go? (a) 0.273 (b) 2.73 (c) 0.0273 (d) 0.00273
  39. 39.0.61 × 0.5 — where does the decimal point go? (a) 0.305 (b) 3.05 (c) 0.0305 (d) 0.00305
  40. 40.0.49 × 1.8 — where does the decimal point go? (a) 0.0882 (b) 0.00882 (c) 0.882 (d) 8.82

Answer key

  1. 0.418
  2. 6.24
  3. 1.44
  4. 2.72
  5. 2.52
  6. 26.4
  7. 134.4
  8. 11.55
  9. 4.75
  10. 216.2
  11. 0.639
  12. 16.53
  13. 0.333
  14. 0.78
  15. 0.144
  16. 0.142
  17. 0.074
  18. 108.9
  19. 21.06
  20. 0.272
  21. 45.5
  22. 1.83
  23. 40.2
  24. 0.336
  25. 3.92
  26. 52.5
  27. 21.56
  28. 1.054
  29. 6.39
  30. 18.48
  31. 16.2
  32. 15.48
  33. 9.6
  34. 80.5
  35. 36.19
  36. 4.74
  37. 0.343
  38. 0.273
  39. 0.305
  40. 0.882

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