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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 129 · 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. 1.0.54 × 28 — where does the decimal point go? (a) 1.512 (b) 0.1512 (c) 151.2 (d) 15.12
  2. 2.4.6 × 16 — where does the decimal point go? (a) 736 (b) 7.36 (c) 0.736 (d) 73.6
  3. 3.0.86 × 1.2 — where does the decimal point go? (a) 0.1032 (b) 10.32 (c) 0.01032 (d) 1.032
  4. 4.0.42 × 4.9 — where does the decimal point go? (a) 2.058 (b) 0.2058 (c) 0.02058 (d) 20.58
  5. 5.0.22 × 8 — where does the decimal point go? (a) 0.176 (b) 0.0176 (c) 1.76 (d) 17.6
  6. 6.0.49 × 4.4 — where does the decimal point go? (a) 0.2156 (b) 21.56 (c) 0.02156 (d) 2.156
  7. 7.0.57 × 3.5 — where does the decimal point go? (a) 0.01995 (b) 19.95 (c) 0.1995 (d) 1.995
  8. 8.0.71 × 0.9 — where does the decimal point go? (a) 0.639 (b) 0.00639 (c) 6.39 (d) 0.0639
  9. 9.0.54 × 3 — where does the decimal point go? (a) 0.162 (b) 0.0162 (c) 16.2 (d) 1.62
  10. 10.5.2 × 3 — where does the decimal point go? (a) 0.156 (b) 15.6 (c) 1.56 (d) 156
  11. 11.7.7 × 0.7 — where does the decimal point go? (a) 0.539 (b) 0.0539 (c) 53.9 (d) 5.39
  12. 12.7.1 × 3 — where does the decimal point go? (a) 2.13 (b) 0.213 (c) 21.3 (d) 213
  13. 13.3.9 × 34 — where does the decimal point go? (a) 1.326 (b) 1326 (c) 13.26 (d) 132.6
  14. 14.0.51 × 8 — where does the decimal point go? (a) 0.408 (b) 0.0408 (c) 40.8 (d) 4.08
  15. 15.0.84 × 0.3 — where does the decimal point go? (a) 0.252 (b) 2.52 (c) 0.00252 (d) 0.0252
  16. 16.4.4 × 3 — where does the decimal point go? (a) 0.132 (b) 13.2 (c) 132 (d) 1.32
  17. 17.2.6 × 13 — where does the decimal point go? (a) 338 (b) 0.338 (c) 3.38 (d) 33.8
  18. 18.7.1 × 4 — where does the decimal point go? (a) 28.4 (b) 2.84 (c) 284 (d) 0.284
  19. 19.0.31 × 0.3 — where does the decimal point go? (a) 0.0093 (b) 0.93 (c) 0.00093 (d) 0.093
  20. 20.1.7 × 46 — where does the decimal point go? (a) 7.82 (b) 0.782 (c) 782 (d) 78.2
  21. 21.4.8 × 6 — where does the decimal point go? (a) 0.288 (b) 2.88 (c) 28.8 (d) 288
  22. 22.0.89 × 2.5 — where does the decimal point go? (a) 2.225 (b) 22.25 (c) 0.02225 (d) 0.2225
  23. 23.7.6 × 0.7 — where does the decimal point go? (a) 5.32 (b) 0.0532 (c) 53.2 (d) 0.532
  24. 24.1.7 × 6 — where does the decimal point go? (a) 1.02 (b) 0.102 (c) 102 (d) 10.2
  25. 25.2.7 × 0.6 — where does the decimal point go? (a) 0.0162 (b) 16.2 (c) 0.162 (d) 1.62
  26. 26.0.63 × 7 — where does the decimal point go? (a) 0.0441 (b) 44.1 (c) 0.441 (d) 4.41
  27. 27.4.1 × 0.8 — where does the decimal point go? (a) 0.328 (b) 0.0328 (c) 3.28 (d) 32.8
  28. 28.7.9 × 4.4 — where does the decimal point go? (a) 347.6 (b) 0.3476 (c) 34.76 (d) 3.476
  29. 29.0.72 × 0.9 — where does the decimal point go? (a) 6.48 (b) 0.00648 (c) 0.648 (d) 0.0648
  30. 30.1.3 × 11 — where does the decimal point go? (a) 14.3 (b) 143 (c) 0.143 (d) 1.43
  31. 31.9.3 × 5 — where does the decimal point go? (a) 465 (b) 4.65 (c) 46.5 (d) 0.465
  32. 32.7.1 × 9 — where does the decimal point go? (a) 0.639 (b) 639 (c) 6.39 (d) 63.9
  33. 33.7.8 × 22 — where does the decimal point go? (a) 17.16 (b) 1.716 (c) 1716 (d) 171.6
  34. 34.3.9 × 0.4 — where does the decimal point go? (a) 0.156 (b) 15.6 (c) 0.0156 (d) 1.56
  35. 35.4.9 × 2.2 — where does the decimal point go? (a) 1.078 (b) 0.1078 (c) 10.78 (d) 107.8
  36. 36.0.56 × 0.8 — where does the decimal point go? (a) 4.48 (b) 0.0448 (c) 0.00448 (d) 0.448
  37. 37.0.28 × 8 — where does the decimal point go? (a) 0.224 (b) 22.4 (c) 0.0224 (d) 2.24
  38. 38.0.87 × 2.2 — where does the decimal point go? (a) 0.1914 (b) 1.914 (c) 19.14 (d) 0.01914
  39. 39.0.12 × 2.8 — where does the decimal point go? (a) 3.36 (b) 0.336 (c) 0.0336 (d) 0.00336
  40. 40.4.4 × 3.2 — where does the decimal point go? (a) 140.8 (b) 1.408 (c) 0.1408 (d) 14.08

Answer key

  1. 15.12
  2. 73.6
  3. 1.032
  4. 2.058
  5. 1.76
  6. 2.156
  7. 1.995
  8. 0.639
  9. 1.62
  10. 15.6
  11. 5.39
  12. 21.3
  13. 132.6
  14. 4.08
  15. 0.252
  16. 13.2
  17. 33.8
  18. 28.4
  19. 0.093
  20. 78.2
  21. 28.8
  22. 2.225
  23. 5.32
  24. 10.2
  25. 1.62
  26. 4.41
  27. 3.28
  28. 34.76
  29. 0.648
  30. 14.3
  31. 46.5
  32. 63.9
  33. 171.6
  34. 1.56
  35. 10.78
  36. 0.448
  37. 2.24
  38. 1.914
  39. 0.336
  40. 14.08

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