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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 757 · 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. 1.0.61 × 2 — where does the decimal point go? (a) 0.122 (b) 0.0122 (c) 1.22 (d) 12.2
  2. 2.2.8 × 0.2 — where does the decimal point go? (a) 0.56 (b) 0.0056 (c) 0.056 (d) 5.6
  3. 3.0.21 × 2 — where does the decimal point go? (a) 0.42 (b) 0.0042 (c) 0.042 (d) 4.2
  4. 4.0.19 × 28 — where does the decimal point go? (a) 5.32 (b) 0.532 (c) 53.2 (d) 0.0532
  5. 5.3.1 × 29 — where does the decimal point go? (a) 8.99 (b) 89.9 (c) 899 (d) 0.899
  6. 6.0.89 × 3.8 — where does the decimal point go? (a) 0.3382 (b) 3.382 (c) 0.03382 (d) 33.82
  7. 7.9.2 × 3.6 — where does the decimal point go? (a) 3.312 (b) 33.12 (c) 331.2 (d) 0.3312
  8. 8.0.13 × 1.6 — where does the decimal point go? (a) 0.00208 (b) 0.0208 (c) 0.208 (d) 2.08
  9. 9.1.2 × 0.2 — where does the decimal point go? (a) 0.024 (b) 0.0024 (c) 2.4 (d) 0.24
  10. 10.3.9 × 44 — where does the decimal point go? (a) 17.16 (b) 1716 (c) 171.6 (d) 1.716
  11. 11.0.31 × 2 — where does the decimal point go? (a) 0.062 (b) 0.0062 (c) 0.62 (d) 6.2
  12. 12.0.75 × 31 — where does the decimal point go? (a) 232.5 (b) 23.25 (c) 0.2325 (d) 2.325
  13. 13.0.28 × 4.1 — where does the decimal point go? (a) 1.148 (b) 0.1148 (c) 0.01148 (d) 11.48
  14. 14.3.7 × 0.5 — where does the decimal point go? (a) 1.85 (b) 0.185 (c) 18.5 (d) 0.0185
  15. 15.8.6 × 19 — where does the decimal point go? (a) 163.4 (b) 16.34 (c) 1.634 (d) 1634
  16. 16.0.96 × 9 — where does the decimal point go? (a) 0.0864 (b) 86.4 (c) 0.864 (d) 8.64
  17. 17.0.57 × 21 — where does the decimal point go? (a) 11.97 (b) 1.197 (c) 119.7 (d) 0.1197
  18. 18.3.6 × 1.2 — where does the decimal point go? (a) 0.0432 (b) 0.432 (c) 4.32 (d) 43.2
  19. 19.3.2 × 0.2 — where does the decimal point go? (a) 0.064 (b) 0.0064 (c) 6.4 (d) 0.64
  20. 20.1.9 × 7 — where does the decimal point go? (a) 1.33 (b) 13.3 (c) 133 (d) 0.133
  21. 21.0.53 × 2.7 — where does the decimal point go? (a) 14.31 (b) 0.1431 (c) 1.431 (d) 0.01431
  22. 22.3.3 × 3.3 — where does the decimal point go? (a) 0.1089 (b) 1.089 (c) 10.89 (d) 108.9
  23. 23.4.6 × 1.7 — where does the decimal point go? (a) 7.82 (b) 78.2 (c) 0.0782 (d) 0.782
  24. 24.4.2 × 3.2 — where does the decimal point go? (a) 1.344 (b) 0.1344 (c) 13.44 (d) 134.4
  25. 25.3.3 × 3 — where does the decimal point go? (a) 99 (b) 0.099 (c) 0.99 (d) 9.9
  26. 26.0.26 × 3.3 — where does the decimal point go? (a) 0.0858 (b) 8.58 (c) 0.858 (d) 0.00858
  27. 27.0.59 × 0.2 — where does the decimal point go? (a) 0.118 (b) 0.0118 (c) 1.18 (d) 0.00118
  28. 28.0.93 × 2 — where does the decimal point go? (a) 0.186 (b) 1.86 (c) 18.6 (d) 0.0186
  29. 29.4.6 × 4 — where does the decimal point go? (a) 184 (b) 1.84 (c) 0.184 (d) 18.4
  30. 30.7.8 × 3.9 — where does the decimal point go? (a) 0.3042 (b) 3.042 (c) 30.42 (d) 304.2
  31. 31.0.88 × 3 — where does the decimal point go? (a) 26.4 (b) 2.64 (c) 0.0264 (d) 0.264
  32. 32.7.2 × 4 — where does the decimal point go? (a) 288 (b) 2.88 (c) 28.8 (d) 0.288
  33. 33.9.9 × 3 — where does the decimal point go? (a) 2.97 (b) 29.7 (c) 297 (d) 0.297
  34. 34.0.81 × 5 — where does the decimal point go? (a) 4.05 (b) 0.405 (c) 0.0405 (d) 40.5
  35. 35.0.72 × 14 — where does the decimal point go? (a) 10.08 (b) 100.8 (c) 0.1008 (d) 1.008
  36. 36.0.51 × 5 — where does the decimal point go? (a) 0.255 (b) 0.0255 (c) 25.5 (d) 2.55
  37. 37.3.6 × 6 — where does the decimal point go? (a) 216 (b) 21.6 (c) 0.216 (d) 2.16
  38. 38.6.9 × 4.3 — where does the decimal point go? (a) 0.2967 (b) 296.7 (c) 29.67 (d) 2.967
  39. 39.5.8 × 4.3 — where does the decimal point go? (a) 0.2494 (b) 249.4 (c) 2.494 (d) 24.94
  40. 40.3.5 × 1.3 — where does the decimal point go? (a) 4.55 (b) 0.455 (c) 45.5 (d) 0.0455

Answer key

  1. 1.22
  2. 0.56
  3. 0.42
  4. 5.32
  5. 89.9
  6. 3.382
  7. 33.12
  8. 0.208
  9. 0.24
  10. 171.6
  11. 0.62
  12. 23.25
  13. 1.148
  14. 1.85
  15. 163.4
  16. 8.64
  17. 11.97
  18. 4.32
  19. 0.64
  20. 13.3
  21. 1.431
  22. 10.89
  23. 7.82
  24. 13.44
  25. 9.9
  26. 0.858
  27. 0.118
  28. 1.86
  29. 18.4
  30. 30.42
  31. 2.64
  32. 28.8
  33. 29.7
  34. 4.05
  35. 10.08
  36. 2.55
  37. 21.6
  38. 29.67
  39. 24.94
  40. 4.55

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