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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 255 · 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. 1.3.9 × 0.2 — where does the decimal point go? (a) 0.78 (b) 7.8 (c) 0.078 (d) 0.0078
  2. 2.1.9 × 5 — where does the decimal point go? (a) 0.095 (b) 0.95 (c) 95 (d) 9.5
  3. 3.0.73 × 0.9 — where does the decimal point go? (a) 0.0657 (b) 6.57 (c) 0.00657 (d) 0.657
  4. 4.0.27 × 21 — where does the decimal point go? (a) 0.0567 (b) 0.567 (c) 56.7 (d) 5.67
  5. 5.3.4 × 41 — where does the decimal point go? (a) 139.4 (b) 1.394 (c) 13.94 (d) 1394
  6. 6.0.97 × 17 — where does the decimal point go? (a) 164.9 (b) 1.649 (c) 0.1649 (d) 16.49
  7. 7.2.3 × 0.4 — where does the decimal point go? (a) 0.0092 (b) 0.092 (c) 0.92 (d) 9.2
  8. 8.0.17 × 12 — where does the decimal point go? (a) 20.4 (b) 0.0204 (c) 2.04 (d) 0.204
  9. 9.0.54 × 44 — where does the decimal point go? (a) 0.2376 (b) 2.376 (c) 237.6 (d) 23.76
  10. 10.1.7 × 1.2 — where does the decimal point go? (a) 2.04 (b) 0.204 (c) 20.4 (d) 0.0204
  11. 11.7.8 × 0.3 — where does the decimal point go? (a) 2.34 (b) 0.0234 (c) 0.234 (d) 23.4
  12. 12.1.3 × 2 — where does the decimal point go? (a) 2.6 (b) 0.026 (c) 26 (d) 0.26
  13. 13.4.7 × 4.4 — where does the decimal point go? (a) 2.068 (b) 0.2068 (c) 20.68 (d) 206.8
  14. 14.0.76 × 0.2 — where does the decimal point go? (a) 0.152 (b) 1.52 (c) 0.0152 (d) 0.00152
  15. 15.9.2 × 4.2 — where does the decimal point go? (a) 3.864 (b) 38.64 (c) 0.3864 (d) 386.4
  16. 16.0.95 × 0.5 — where does the decimal point go? (a) 0.0475 (b) 4.75 (c) 0.00475 (d) 0.475
  17. 17.9.4 × 1.8 — where does the decimal point go? (a) 16.92 (b) 169.2 (c) 0.1692 (d) 1.692
  18. 18.0.43 × 4.6 — where does the decimal point go? (a) 1.978 (b) 0.01978 (c) 19.78 (d) 0.1978
  19. 19.0.69 × 0.2 — where does the decimal point go? (a) 0.138 (b) 1.38 (c) 0.00138 (d) 0.0138
  20. 20.0.36 × 2.1 — where does the decimal point go? (a) 0.00756 (b) 0.0756 (c) 0.756 (d) 7.56
  21. 21.0.19 × 0.4 — where does the decimal point go? (a) 0.76 (b) 0.00076 (c) 0.0076 (d) 0.076
  22. 22.0.14 × 3 — where does the decimal point go? (a) 0.042 (b) 0.0042 (c) 4.2 (d) 0.42
  23. 23.0.44 × 22 — where does the decimal point go? (a) 0.0968 (b) 0.968 (c) 96.8 (d) 9.68
  24. 24.7.8 × 29 — where does the decimal point go? (a) 2.262 (b) 226.2 (c) 22.62 (d) 2262
  25. 25.2.3 × 1.5 — where does the decimal point go? (a) 34.5 (b) 3.45 (c) 0.0345 (d) 0.345
  26. 26.0.24 × 0.3 — where does the decimal point go? (a) 0.072 (b) 0.72 (c) 0.0072 (d) 0.00072
  27. 27.8.3 × 0.5 — where does the decimal point go? (a) 41.5 (b) 4.15 (c) 0.415 (d) 0.0415
  28. 28.1.3 × 3 — where does the decimal point go? (a) 39 (b) 3.9 (c) 0.039 (d) 0.39
  29. 29.0.26 × 7 — where does the decimal point go? (a) 0.0182 (b) 0.182 (c) 18.2 (d) 1.82
  30. 30.7.9 × 9 — where does the decimal point go? (a) 71.1 (b) 711 (c) 7.11 (d) 0.711
  31. 31.0.18 × 37 — where does the decimal point go? (a) 0.0666 (b) 66.6 (c) 6.66 (d) 0.666
  32. 32.9.2 × 4 — where does the decimal point go? (a) 3.68 (b) 36.8 (c) 368 (d) 0.368
  33. 33.7.6 × 2 — where does the decimal point go? (a) 1.52 (b) 15.2 (c) 0.152 (d) 152
  34. 34.0.88 × 0.6 — where does the decimal point go? (a) 0.00528 (b) 0.0528 (c) 0.528 (d) 5.28
  35. 35.8.2 × 0.4 — where does the decimal point go? (a) 3.28 (b) 0.0328 (c) 0.328 (d) 32.8
  36. 36.0.71 × 19 — where does the decimal point go? (a) 134.9 (b) 1.349 (c) 0.1349 (d) 13.49
  37. 37.0.33 × 1.5 — where does the decimal point go? (a) 0.00495 (b) 0.0495 (c) 4.95 (d) 0.495
  38. 38.0.27 × 0.3 — where does the decimal point go? (a) 0.81 (b) 0.0081 (c) 0.00081 (d) 0.081
  39. 39.3.7 × 6 — where does the decimal point go? (a) 0.222 (b) 2.22 (c) 222 (d) 22.2
  40. 40.4.5 × 5 — where does the decimal point go? (a) 2.25 (b) 22.5 (c) 225 (d) 0.225

Answer key

  1. 0.78
  2. 9.5
  3. 0.657
  4. 5.67
  5. 139.4
  6. 16.49
  7. 0.92
  8. 2.04
  9. 23.76
  10. 2.04
  11. 2.34
  12. 2.6
  13. 20.68
  14. 0.152
  15. 38.64
  16. 0.475
  17. 16.92
  18. 1.978
  19. 0.138
  20. 0.756
  21. 0.076
  22. 0.42
  23. 9.68
  24. 226.2
  25. 3.45
  26. 0.072
  27. 4.15
  28. 3.9
  29. 1.82
  30. 71.1
  31. 6.66
  32. 36.8
  33. 15.2
  34. 0.528
  35. 3.28
  36. 13.49
  37. 0.495
  38. 0.081
  39. 22.2
  40. 22.5

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