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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 690 · 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. 1.4.7 × 4.7 — where does the decimal point go? (a) 0.2209 (b) 2.209 (c) 22.09 (d) 220.9
  2. 2.0.91 × 0.5 — where does the decimal point go? (a) 0.00455 (b) 0.0455 (c) 0.455 (d) 4.55
  3. 3.1.6 × 0.2 — where does the decimal point go? (a) 0.032 (b) 0.32 (c) 0.0032 (d) 3.2
  4. 4.0.82 × 2 — where does the decimal point go? (a) 0.0164 (b) 0.164 (c) 16.4 (d) 1.64
  5. 5.0.56 × 4 — where does the decimal point go? (a) 0.0224 (b) 2.24 (c) 0.224 (d) 22.4
  6. 6.0.94 × 3.7 — where does the decimal point go? (a) 0.03478 (b) 3.478 (c) 34.78 (d) 0.3478
  7. 7.0.73 × 3 — where does the decimal point go? (a) 0.0219 (b) 21.9 (c) 0.219 (d) 2.19
  8. 8.2.9 × 31 — where does the decimal point go? (a) 899 (b) 8.99 (c) 0.899 (d) 89.9
  9. 9.0.53 × 39 — where does the decimal point go? (a) 0.2067 (b) 206.7 (c) 20.67 (d) 2.067
  10. 10.0.88 × 9 — where does the decimal point go? (a) 0.0792 (b) 7.92 (c) 79.2 (d) 0.792
  11. 11.3.7 × 44 — where does the decimal point go? (a) 16.28 (b) 162.8 (c) 1628 (d) 1.628
  12. 12.0.17 × 0.2 — where does the decimal point go? (a) 0.034 (b) 0.0034 (c) 0.34 (d) 0.00034
  13. 13.6.9 × 7 — where does the decimal point go? (a) 483 (b) 48.3 (c) 0.483 (d) 4.83
  14. 14.5.8 × 29 — where does the decimal point go? (a) 16.82 (b) 168.2 (c) 1.682 (d) 1682
  15. 15.0.37 × 0.9 — where does the decimal point go? (a) 3.33 (b) 0.333 (c) 0.0333 (d) 0.00333
  16. 16.1.4 × 0.3 — where does the decimal point go? (a) 0.042 (b) 0.42 (c) 4.2 (d) 0.0042
  17. 17.3.8 × 2.1 — where does the decimal point go? (a) 0.0798 (b) 79.8 (c) 7.98 (d) 0.798
  18. 18.0.16 × 2 — where does the decimal point go? (a) 0.032 (b) 0.32 (c) 0.0032 (d) 3.2
  19. 19.0.57 × 9 — where does the decimal point go? (a) 5.13 (b) 0.0513 (c) 0.513 (d) 51.3
  20. 20.0.71 × 19 — where does the decimal point go? (a) 13.49 (b) 0.1349 (c) 134.9 (d) 1.349
  21. 21.0.97 × 4 — where does the decimal point go? (a) 3.88 (b) 0.0388 (c) 0.388 (d) 38.8
  22. 22.2.4 × 42 — where does the decimal point go? (a) 100.8 (b) 10.08 (c) 1.008 (d) 1008
  23. 23.0.13 × 0.7 — where does the decimal point go? (a) 0.00091 (b) 0.91 (c) 0.091 (d) 0.0091
  24. 24.3.2 × 0.3 — where does the decimal point go? (a) 0.96 (b) 0.096 (c) 9.6 (d) 0.0096
  25. 25.0.64 × 4.3 — where does the decimal point go? (a) 27.52 (b) 0.2752 (c) 0.02752 (d) 2.752
  26. 26.5.8 × 0.3 — where does the decimal point go? (a) 1.74 (b) 17.4 (c) 0.0174 (d) 0.174
  27. 27.0.64 × 4 — where does the decimal point go? (a) 25.6 (b) 0.0256 (c) 0.256 (d) 2.56
  28. 28.5.5 × 21 — where does the decimal point go? (a) 1155 (b) 115.5 (c) 11.55 (d) 1.155
  29. 29.2.7 × 0.5 — where does the decimal point go? (a) 0.0135 (b) 13.5 (c) 1.35 (d) 0.135
  30. 30.8.8 × 0.9 — where does the decimal point go? (a) 0.792 (b) 0.0792 (c) 79.2 (d) 7.92
  31. 31.0.44 × 3 — where does the decimal point go? (a) 0.0132 (b) 0.132 (c) 13.2 (d) 1.32
  32. 32.8.2 × 0.4 — where does the decimal point go? (a) 0.328 (b) 3.28 (c) 0.0328 (d) 32.8
  33. 33.6.1 × 6 — where does the decimal point go? (a) 366 (b) 3.66 (c) 0.366 (d) 36.6
  34. 34.8.1 × 2.7 — where does the decimal point go? (a) 2.187 (b) 0.2187 (c) 21.87 (d) 218.7
  35. 35.3.6 × 0.9 — where does the decimal point go? (a) 0.324 (b) 3.24 (c) 32.4 (d) 0.0324
  36. 36.0.12 × 8 — where does the decimal point go? (a) 0.0096 (b) 9.6 (c) 0.96 (d) 0.096
  37. 37.5.3 × 6 — where does the decimal point go? (a) 0.318 (b) 318 (c) 3.18 (d) 31.8
  38. 38.0.39 × 3 — where does the decimal point go? (a) 0.117 (b) 0.0117 (c) 11.7 (d) 1.17
  39. 39.2.9 × 4 — where does the decimal point go? (a) 1.16 (b) 116 (c) 0.116 (d) 11.6
  40. 40.3.7 × 0.3 — where does the decimal point go? (a) 1.11 (b) 0.111 (c) 0.0111 (d) 11.1

Answer key

  1. 22.09
  2. 0.455
  3. 0.32
  4. 1.64
  5. 2.24
  6. 3.478
  7. 2.19
  8. 89.9
  9. 20.67
  10. 7.92
  11. 162.8
  12. 0.034
  13. 48.3
  14. 168.2
  15. 0.333
  16. 0.42
  17. 7.98
  18. 0.32
  19. 5.13
  20. 13.49
  21. 3.88
  22. 100.8
  23. 0.091
  24. 0.96
  25. 2.752
  26. 1.74
  27. 2.56
  28. 115.5
  29. 1.35
  30. 7.92
  31. 1.32
  32. 3.28
  33. 36.6
  34. 21.87
  35. 3.24
  36. 0.96
  37. 31.8
  38. 1.17
  39. 11.6
  40. 1.11

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