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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 755 · 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. 1.1.7 × 17 — where does the decimal point go? (a) 0.289 (b) 289 (c) 2.89 (d) 28.9
  2. 2.7.2 × 0.9 — where does the decimal point go? (a) 0.0648 (b) 6.48 (c) 64.8 (d) 0.648
  3. 3.8.4 × 2 — where does the decimal point go? (a) 0.168 (b) 168 (c) 16.8 (d) 1.68
  4. 4.0.77 × 4 — where does the decimal point go? (a) 3.08 (b) 0.0308 (c) 0.308 (d) 30.8
  5. 5.4.4 × 9 — where does the decimal point go? (a) 396 (b) 0.396 (c) 39.6 (d) 3.96
  6. 6.9.7 × 4.6 — where does the decimal point go? (a) 4.462 (b) 44.62 (c) 446.2 (d) 0.4462
  7. 7.0.93 × 3.3 — where does the decimal point go? (a) 0.3069 (b) 30.69 (c) 0.03069 (d) 3.069
  8. 8.1.6 × 0.4 — where does the decimal point go? (a) 0.064 (b) 0.0064 (c) 6.4 (d) 0.64
  9. 9.0.79 × 0.5 — where does the decimal point go? (a) 0.395 (b) 0.00395 (c) 0.0395 (d) 3.95
  10. 10.3.3 × 32 — where does the decimal point go? (a) 10.56 (b) 105.6 (c) 1056 (d) 1.056
  11. 11.4.2 × 41 — where does the decimal point go? (a) 172.2 (b) 1.722 (c) 1722 (d) 17.22
  12. 12.4.5 × 29 — where does the decimal point go? (a) 13.05 (b) 1.305 (c) 130.5 (d) 1305
  13. 13.8.9 × 4.2 — where does the decimal point go? (a) 373.8 (b) 3.738 (c) 37.38 (d) 0.3738
  14. 14.4.5 × 3 — where does the decimal point go? (a) 0.135 (b) 13.5 (c) 1.35 (d) 135
  15. 15.0.89 × 2 — where does the decimal point go? (a) 17.8 (b) 0.178 (c) 1.78 (d) 0.0178
  16. 16.0.87 × 5 — where does the decimal point go? (a) 0.0435 (b) 4.35 (c) 43.5 (d) 0.435
  17. 17.7.8 × 0.2 — where does the decimal point go? (a) 0.156 (b) 15.6 (c) 0.0156 (d) 1.56
  18. 18.7.5 × 0.5 — where does the decimal point go? (a) 0.375 (b) 0.0375 (c) 37.5 (d) 3.75
  19. 19.0.65 × 0.9 — where does the decimal point go? (a) 0.00585 (b) 0.0585 (c) 5.85 (d) 0.585
  20. 20.0.37 × 2 — where does the decimal point go? (a) 7.4 (b) 0.074 (c) 0.74 (d) 0.0074
  21. 21.4.8 × 4.7 — where does the decimal point go? (a) 225.6 (b) 22.56 (c) 2.256 (d) 0.2256
  22. 22.7.1 × 4.2 — where does the decimal point go? (a) 2.982 (b) 29.82 (c) 298.2 (d) 0.2982
  23. 23.4.8 × 0.2 — where does the decimal point go? (a) 0.096 (b) 9.6 (c) 0.0096 (d) 0.96
  24. 24.8.3 × 8 — where does the decimal point go? (a) 6.64 (b) 66.4 (c) 664 (d) 0.664
  25. 25.0.34 × 4.2 — where does the decimal point go? (a) 0.01428 (b) 1.428 (c) 0.1428 (d) 14.28
  26. 26.9.9 × 4 — where does the decimal point go? (a) 396 (b) 3.96 (c) 39.6 (d) 0.396
  27. 27.0.59 × 0.3 — where does the decimal point go? (a) 0.177 (b) 0.0177 (c) 1.77 (d) 0.00177
  28. 28.0.38 × 0.9 — where does the decimal point go? (a) 0.342 (b) 3.42 (c) 0.0342 (d) 0.00342
  29. 29.3.4 × 2.3 — where does the decimal point go? (a) 0.0782 (b) 7.82 (c) 0.782 (d) 78.2
  30. 30.0.57 × 1.9 — where does the decimal point go? (a) 0.01083 (b) 0.1083 (c) 1.083 (d) 10.83
  31. 31.0.99 × 23 — where does the decimal point go? (a) 227.7 (b) 2.277 (c) 22.77 (d) 0.2277
  32. 32.0.84 × 6 — where does the decimal point go? (a) 50.4 (b) 0.0504 (c) 0.504 (d) 5.04
  33. 33.0.34 × 48 — where does the decimal point go? (a) 0.1632 (b) 163.2 (c) 1.632 (d) 16.32
  34. 34.3.1 × 0.6 — where does the decimal point go? (a) 18.6 (b) 0.0186 (c) 0.186 (d) 1.86
  35. 35.5.7 × 9 — where does the decimal point go? (a) 5.13 (b) 513 (c) 0.513 (d) 51.3
  36. 36.1.4 × 4 — where does the decimal point go? (a) 56 (b) 0.56 (c) 5.6 (d) 0.056
  37. 37.4.5 × 0.5 — where does the decimal point go? (a) 0.225 (b) 0.0225 (c) 22.5 (d) 2.25
  38. 38.0.63 × 24 — where does the decimal point go? (a) 15.12 (b) 0.1512 (c) 1.512 (d) 151.2
  39. 39.4.3 × 13 — where does the decimal point go? (a) 5.59 (b) 559 (c) 55.9 (d) 0.559
  40. 40.0.59 × 0.7 — where does the decimal point go? (a) 0.0413 (b) 0.413 (c) 0.00413 (d) 4.13

Answer key

  1. 28.9
  2. 6.48
  3. 16.8
  4. 3.08
  5. 39.6
  6. 44.62
  7. 3.069
  8. 0.64
  9. 0.395
  10. 105.6
  11. 172.2
  12. 130.5
  13. 37.38
  14. 13.5
  15. 1.78
  16. 4.35
  17. 1.56
  18. 3.75
  19. 0.585
  20. 0.74
  21. 22.56
  22. 29.82
  23. 0.96
  24. 66.4
  25. 1.428
  26. 39.6
  27. 0.177
  28. 0.342
  29. 7.82
  30. 1.083
  31. 22.77
  32. 5.04
  33. 16.32
  34. 1.86
  35. 51.3
  36. 5.6
  37. 2.25
  38. 15.12
  39. 55.9
  40. 0.413

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