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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 768 · 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. 1.7.1 × 9 — where does the decimal point go? (a) 63.9 (b) 639 (c) 6.39 (d) 0.639
  2. 2.0.73 × 2 — where does the decimal point go? (a) 1.46 (b) 0.146 (c) 0.0146 (d) 14.6
  3. 3.6.7 × 7 — where does the decimal point go? (a) 0.469 (b) 4.69 (c) 46.9 (d) 469
  4. 4.0.32 × 4 — where does the decimal point go? (a) 1.28 (b) 0.128 (c) 12.8 (d) 0.0128
  5. 5.1.8 × 0.3 — where does the decimal point go? (a) 0.54 (b) 0.054 (c) 5.4 (d) 0.0054
  6. 6.1.3 × 38 — where does the decimal point go? (a) 49.4 (b) 494 (c) 4.94 (d) 0.494
  7. 7.0.75 × 39 — where does the decimal point go? (a) 29.25 (b) 292.5 (c) 0.2925 (d) 2.925
  8. 8.2.7 × 0.3 — where does the decimal point go? (a) 0.81 (b) 0.081 (c) 0.0081 (d) 8.1
  9. 9.7.1 × 0.6 — where does the decimal point go? (a) 4.26 (b) 42.6 (c) 0.426 (d) 0.0426
  10. 10.0.93 × 3.7 — where does the decimal point go? (a) 3.441 (b) 0.03441 (c) 0.3441 (d) 34.41
  11. 11.0.14 × 19 — where does the decimal point go? (a) 2.66 (b) 0.266 (c) 26.6 (d) 0.0266
  12. 12.1.7 × 6 — where does the decimal point go? (a) 10.2 (b) 1.02 (c) 0.102 (d) 102
  13. 13.0.76 × 2 — where does the decimal point go? (a) 1.52 (b) 0.0152 (c) 0.152 (d) 15.2
  14. 14.4.3 × 0.4 — where does the decimal point go? (a) 0.0172 (b) 17.2 (c) 0.172 (d) 1.72
  15. 15.8.2 × 46 — where does the decimal point go? (a) 377.2 (b) 37.72 (c) 3.772 (d) 3772
  16. 16.0.22 × 3.7 — where does the decimal point go? (a) 0.0814 (b) 0.00814 (c) 8.14 (d) 0.814
  17. 17.5.1 × 31 — where does the decimal point go? (a) 15.81 (b) 1.581 (c) 158.1 (d) 1581
  18. 18.0.69 × 2.9 — where does the decimal point go? (a) 2.001 (b) 0.02001 (c) 0.2001 (d) 20.01
  19. 19.0.24 × 27 — where does the decimal point go? (a) 0.648 (b) 64.8 (c) 6.48 (d) 0.0648
  20. 20.0.36 × 18 — where does the decimal point go? (a) 0.648 (b) 6.48 (c) 64.8 (d) 0.0648
  21. 21.0.14 × 7 — where does the decimal point go? (a) 0.98 (b) 9.8 (c) 0.098 (d) 0.0098
  22. 22.0.51 × 0.7 — where does the decimal point go? (a) 3.57 (b) 0.00357 (c) 0.357 (d) 0.0357
  23. 23.2.5 × 2.5 — where does the decimal point go? (a) 0.0625 (b) 62.5 (c) 6.25 (d) 0.625
  24. 24.0.62 × 0.2 — where does the decimal point go? (a) 0.124 (b) 1.24 (c) 0.00124 (d) 0.0124
  25. 25.0.26 × 22 — where does the decimal point go? (a) 5.72 (b) 57.2 (c) 0.0572 (d) 0.572
  26. 26.0.54 × 0.2 — where does the decimal point go? (a) 0.108 (b) 1.08 (c) 0.0108 (d) 0.00108
  27. 27.0.52 × 2.1 — where does the decimal point go? (a) 0.01092 (b) 10.92 (c) 1.092 (d) 0.1092
  28. 28.4.3 × 49 — where does the decimal point go? (a) 210.7 (b) 2107 (c) 21.07 (d) 2.107
  29. 29.4.7 × 8 — where does the decimal point go? (a) 0.376 (b) 37.6 (c) 376 (d) 3.76
  30. 30.9.9 × 5 — where does the decimal point go? (a) 49.5 (b) 4.95 (c) 495 (d) 0.495
  31. 31.2.4 × 2 — where does the decimal point go? (a) 4.8 (b) 0.048 (c) 0.48 (d) 48
  32. 32.3.5 × 33 — where does the decimal point go? (a) 11.55 (b) 1155 (c) 115.5 (d) 1.155
  33. 33.5.1 × 3.3 — where does the decimal point go? (a) 16.83 (b) 1.683 (c) 168.3 (d) 0.1683
  34. 34.1.7 × 34 — where does the decimal point go? (a) 578 (b) 5.78 (c) 57.8 (d) 0.578
  35. 35.4.3 × 6 — where does the decimal point go? (a) 25.8 (b) 2.58 (c) 258 (d) 0.258
  36. 36.2.5 × 1.7 — where does the decimal point go? (a) 42.5 (b) 4.25 (c) 0.0425 (d) 0.425
  37. 37.0.41 × 0.9 — where does the decimal point go? (a) 3.69 (b) 0.00369 (c) 0.369 (d) 0.0369
  38. 38.2.4 × 0.7 — where does the decimal point go? (a) 16.8 (b) 0.168 (c) 0.0168 (d) 1.68
  39. 39.0.73 × 5 — where does the decimal point go? (a) 3.65 (b) 0.365 (c) 0.0365 (d) 36.5
  40. 40.0.28 × 18 — where does the decimal point go? (a) 5.04 (b) 0.0504 (c) 50.4 (d) 0.504

Answer key

  1. 63.9
  2. 1.46
  3. 46.9
  4. 1.28
  5. 0.54
  6. 49.4
  7. 29.25
  8. 0.81
  9. 4.26
  10. 3.441
  11. 2.66
  12. 10.2
  13. 1.52
  14. 1.72
  15. 377.2
  16. 0.814
  17. 158.1
  18. 2.001
  19. 6.48
  20. 6.48
  21. 0.98
  22. 0.357
  23. 6.25
  24. 0.124
  25. 5.72
  26. 0.108
  27. 1.092
  28. 210.7
  29. 37.6
  30. 49.5
  31. 4.8
  32. 115.5
  33. 16.83
  34. 57.8
  35. 25.8
  36. 4.25
  37. 0.369
  38. 1.68
  39. 3.65
  40. 5.04

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