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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 391 · 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. 1.1.5 × 3 — where does the decimal point go? (a) 4.5 (b) 0.045 (c) 45 (d) 0.45
  2. 2.2.8 × 1.9 — where does the decimal point go? (a) 0.0532 (b) 53.2 (c) 0.532 (d) 5.32
  3. 3.0.21 × 48 — where does the decimal point go? (a) 10.08 (b) 1.008 (c) 0.1008 (d) 100.8
  4. 4.3.4 × 6 — where does the decimal point go? (a) 2.04 (b) 20.4 (c) 0.204 (d) 204
  5. 5.6.3 × 9 — where does the decimal point go? (a) 56.7 (b) 567 (c) 5.67 (d) 0.567
  6. 6.2.6 × 0.4 — where does the decimal point go? (a) 1.04 (b) 0.0104 (c) 10.4 (d) 0.104
  7. 7.0.87 × 3.9 — where does the decimal point go? (a) 33.93 (b) 3.393 (c) 0.03393 (d) 0.3393
  8. 8.0.24 × 7 — where does the decimal point go? (a) 0.168 (b) 16.8 (c) 1.68 (d) 0.0168
  9. 9.7.3 × 28 — where does the decimal point go? (a) 2.044 (b) 2044 (c) 20.44 (d) 204.4
  10. 10.0.36 × 0.6 — where does the decimal point go? (a) 0.216 (b) 2.16 (c) 0.0216 (d) 0.00216
  11. 11.0.67 × 2 — where does the decimal point go? (a) 0.134 (b) 0.0134 (c) 13.4 (d) 1.34
  12. 12.0.54 × 7 — where does the decimal point go? (a) 3.78 (b) 0.0378 (c) 0.378 (d) 37.8
  13. 13.0.46 × 34 — where does the decimal point go? (a) 1.564 (b) 0.1564 (c) 156.4 (d) 15.64
  14. 14.0.63 × 0.2 — where does the decimal point go? (a) 0.00126 (b) 0.0126 (c) 0.126 (d) 1.26
  15. 15.2.6 × 46 — where does the decimal point go? (a) 1196 (b) 119.6 (c) 11.96 (d) 1.196
  16. 16.0.26 × 13 — where does the decimal point go? (a) 0.0338 (b) 3.38 (c) 0.338 (d) 33.8
  17. 17.4.8 × 16 — where does the decimal point go? (a) 76.8 (b) 768 (c) 0.768 (d) 7.68
  18. 18.5.9 × 3.4 — where does the decimal point go? (a) 2.006 (b) 20.06 (c) 0.2006 (d) 200.6
  19. 19.0.12 × 0.7 — where does the decimal point go? (a) 0.00084 (b) 0.084 (c) 0.0084 (d) 0.84
  20. 20.5.6 × 3 — where does the decimal point go? (a) 0.168 (b) 1.68 (c) 16.8 (d) 168
  21. 21.8.3 × 0.3 — where does the decimal point go? (a) 0.0249 (b) 24.9 (c) 0.249 (d) 2.49
  22. 22.0.94 × 9 — where does the decimal point go? (a) 84.6 (b) 0.0846 (c) 0.846 (d) 8.46
  23. 23.1.7 × 0.4 — where does the decimal point go? (a) 0.068 (b) 0.68 (c) 6.8 (d) 0.0068
  24. 24.8.9 × 7 — where does the decimal point go? (a) 623 (b) 0.623 (c) 6.23 (d) 62.3
  25. 25.1.9 × 0.9 — where does the decimal point go? (a) 1.71 (b) 17.1 (c) 0.0171 (d) 0.171
  26. 26.1.7 × 38 — where does the decimal point go? (a) 646 (b) 0.646 (c) 64.6 (d) 6.46
  27. 27.4.9 × 4 — where does the decimal point go? (a) 1.96 (b) 19.6 (c) 196 (d) 0.196
  28. 28.0.97 × 24 — where does the decimal point go? (a) 0.2328 (b) 23.28 (c) 2.328 (d) 232.8
  29. 29.5.3 × 4.1 — where does the decimal point go? (a) 217.3 (b) 21.73 (c) 0.2173 (d) 2.173
  30. 30.9.9 × 3.1 — where does the decimal point go? (a) 3.069 (b) 0.3069 (c) 306.9 (d) 30.69
  31. 31.3.8 × 14 — where does the decimal point go? (a) 532 (b) 53.2 (c) 5.32 (d) 0.532
  32. 32.3.3 × 12 — where does the decimal point go? (a) 39.6 (b) 0.396 (c) 3.96 (d) 396
  33. 33.1.6 × 28 — where does the decimal point go? (a) 4.48 (b) 44.8 (c) 448 (d) 0.448
  34. 34.7.9 × 4.4 — where does the decimal point go? (a) 34.76 (b) 3.476 (c) 0.3476 (d) 347.6
  35. 35.0.16 × 3 — where does the decimal point go? (a) 0.048 (b) 0.0048 (c) 4.8 (d) 0.48
  36. 36.7.5 × 0.9 — where does the decimal point go? (a) 6.75 (b) 0.0675 (c) 0.675 (d) 67.5
  37. 37.0.19 × 2.9 — where does the decimal point go? (a) 0.00551 (b) 5.51 (c) 0.0551 (d) 0.551
  38. 38.4.4 × 3 — where does the decimal point go? (a) 1.32 (b) 0.132 (c) 132 (d) 13.2
  39. 39.9.9 × 0.7 — where does the decimal point go? (a) 0.693 (b) 69.3 (c) 6.93 (d) 0.0693
  40. 40.4.9 × 6 — where does the decimal point go? (a) 29.4 (b) 0.294 (c) 2.94 (d) 294

Answer key

  1. 4.5
  2. 5.32
  3. 10.08
  4. 20.4
  5. 56.7
  6. 1.04
  7. 3.393
  8. 1.68
  9. 204.4
  10. 0.216
  11. 1.34
  12. 3.78
  13. 15.64
  14. 0.126
  15. 119.6
  16. 3.38
  17. 76.8
  18. 20.06
  19. 0.084
  20. 16.8
  21. 2.49
  22. 8.46
  23. 0.68
  24. 62.3
  25. 1.71
  26. 64.6
  27. 19.6
  28. 23.28
  29. 21.73
  30. 30.69
  31. 53.2
  32. 39.6
  33. 44.8
  34. 34.76
  35. 0.48
  36. 6.75
  37. 0.551
  38. 13.2
  39. 6.93
  40. 29.4

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