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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 340 · 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. 1.8.9 × 0.2 — where does the decimal point go? (a) 1.78 (b) 17.8 (c) 0.178 (d) 0.0178
  2. 2.2.7 × 0.5 — where does the decimal point go? (a) 1.35 (b) 0.0135 (c) 0.135 (d) 13.5
  3. 3.0.77 × 2 — where does the decimal point go? (a) 0.154 (b) 15.4 (c) 1.54 (d) 0.0154
  4. 4.6.8 × 11 — where does the decimal point go? (a) 74.8 (b) 0.748 (c) 748 (d) 7.48
  5. 5.0.61 × 9 — where does the decimal point go? (a) 0.549 (b) 5.49 (c) 0.0549 (d) 54.9
  6. 6.0.87 × 46 — where does the decimal point go? (a) 0.4002 (b) 40.02 (c) 4.002 (d) 400.2
  7. 7.4.9 × 27 — where does the decimal point go? (a) 13.23 (b) 1323 (c) 1.323 (d) 132.3
  8. 8.4.8 × 0.3 — where does the decimal point go? (a) 0.0144 (b) 1.44 (c) 14.4 (d) 0.144
  9. 9.6.2 × 0.6 — where does the decimal point go? (a) 3.72 (b) 37.2 (c) 0.372 (d) 0.0372
  10. 10.0.36 × 16 — where does the decimal point go? (a) 0.0576 (b) 57.6 (c) 0.576 (d) 5.76
  11. 11.0.84 × 4 — where does the decimal point go? (a) 33.6 (b) 0.0336 (c) 3.36 (d) 0.336
  12. 12.5.9 × 5 — where does the decimal point go? (a) 29.5 (b) 0.295 (c) 295 (d) 2.95
  13. 13.2.8 × 2 — where does the decimal point go? (a) 0.056 (b) 5.6 (c) 56 (d) 0.56
  14. 14.0.22 × 0.7 — where does the decimal point go? (a) 0.154 (b) 0.00154 (c) 1.54 (d) 0.0154
  15. 15.9.1 × 3 — where does the decimal point go? (a) 2.73 (b) 273 (c) 27.3 (d) 0.273
  16. 16.0.13 × 0.9 — where does the decimal point go? (a) 0.0117 (b) 0.117 (c) 1.17 (d) 0.00117
  17. 17.4.7 × 0.8 — where does the decimal point go? (a) 0.376 (b) 0.0376 (c) 3.76 (d) 37.6
  18. 18.3.3 × 3 — where does the decimal point go? (a) 99 (b) 0.099 (c) 9.9 (d) 0.99
  19. 19.1.2 × 3.6 — where does the decimal point go? (a) 43.2 (b) 0.0432 (c) 0.432 (d) 4.32
  20. 20.4.7 × 23 — where does the decimal point go? (a) 1.081 (b) 10.81 (c) 108.1 (d) 1081
  21. 21.0.55 × 5 — where does the decimal point go? (a) 27.5 (b) 2.75 (c) 0.275 (d) 0.0275
  22. 22.8.8 × 2.1 — where does the decimal point go? (a) 1.848 (b) 0.1848 (c) 184.8 (d) 18.48
  23. 23.4.1 × 0.7 — where does the decimal point go? (a) 2.87 (b) 28.7 (c) 0.0287 (d) 0.287
  24. 24.0.59 × 2 — where does the decimal point go? (a) 1.18 (b) 0.118 (c) 0.0118 (d) 11.8
  25. 25.0.35 × 11 — where does the decimal point go? (a) 3.85 (b) 38.5 (c) 0.385 (d) 0.0385
  26. 26.5.8 × 0.8 — where does the decimal point go? (a) 4.64 (b) 0.464 (c) 46.4 (d) 0.0464
  27. 27.5.1 × 0.5 — where does the decimal point go? (a) 25.5 (b) 0.255 (c) 0.0255 (d) 2.55
  28. 28.8.8 × 4 — where does the decimal point go? (a) 0.352 (b) 3.52 (c) 352 (d) 35.2
  29. 29.0.89 × 1.9 — where does the decimal point go? (a) 16.91 (b) 0.01691 (c) 0.1691 (d) 1.691
  30. 30.0.64 × 22 — where does the decimal point go? (a) 140.8 (b) 1.408 (c) 0.1408 (d) 14.08
  31. 31.0.28 × 0.6 — where does the decimal point go? (a) 0.168 (b) 0.0168 (c) 1.68 (d) 0.00168
  32. 32.0.29 × 37 — where does the decimal point go? (a) 0.1073 (b) 107.3 (c) 10.73 (d) 1.073
  33. 33.7.9 × 1.3 — where does the decimal point go? (a) 0.1027 (b) 1.027 (c) 10.27 (d) 102.7
  34. 34.0.24 × 6 — where does the decimal point go? (a) 14.4 (b) 0.0144 (c) 0.144 (d) 1.44
  35. 35.0.13 × 3.6 — where does the decimal point go? (a) 0.00468 (b) 0.468 (c) 0.0468 (d) 4.68
  36. 36.4.1 × 36 — where does the decimal point go? (a) 1476 (b) 1.476 (c) 147.6 (d) 14.76
  37. 37.0.83 × 0.3 — where does the decimal point go? (a) 2.49 (b) 0.0249 (c) 0.249 (d) 0.00249
  38. 38.0.26 × 32 — where does the decimal point go? (a) 0.0832 (b) 0.832 (c) 83.2 (d) 8.32
  39. 39.7.9 × 39 — where does the decimal point go? (a) 30.81 (b) 3081 (c) 308.1 (d) 3.081
  40. 40.0.75 × 2.1 — where does the decimal point go? (a) 0.1575 (b) 0.01575 (c) 15.75 (d) 1.575

Answer key

  1. 1.78
  2. 1.35
  3. 1.54
  4. 74.8
  5. 5.49
  6. 40.02
  7. 132.3
  8. 1.44
  9. 3.72
  10. 5.76
  11. 3.36
  12. 29.5
  13. 5.6
  14. 0.154
  15. 27.3
  16. 0.117
  17. 3.76
  18. 9.9
  19. 4.32
  20. 108.1
  21. 2.75
  22. 18.48
  23. 2.87
  24. 1.18
  25. 3.85
  26. 4.64
  27. 2.55
  28. 35.2
  29. 1.691
  30. 14.08
  31. 0.168
  32. 10.73
  33. 10.27
  34. 1.44
  35. 0.468
  36. 147.6
  37. 0.249
  38. 8.32
  39. 308.1
  40. 1.575

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