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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 666 · 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. 1.0.27 × 0.8 — where does the decimal point go? (a) 0.216 (b) 0.0216 (c) 0.00216 (d) 2.16
  2. 2.0.48 × 7 — where does the decimal point go? (a) 33.6 (b) 3.36 (c) 0.0336 (d) 0.336
  3. 3.2.3 × 9 — where does the decimal point go? (a) 20.7 (b) 207 (c) 2.07 (d) 0.207
  4. 4.8.3 × 23 — where does the decimal point go? (a) 1909 (b) 190.9 (c) 1.909 (d) 19.09
  5. 5.6.1 × 25 — where does the decimal point go? (a) 152.5 (b) 15.25 (c) 1.525 (d) 1525
  6. 6.5.9 × 27 — where does the decimal point go? (a) 159.3 (b) 1.593 (c) 1593 (d) 15.93
  7. 7.8.2 × 3.9 — where does the decimal point go? (a) 31.98 (b) 319.8 (c) 0.3198 (d) 3.198
  8. 8.3.4 × 0.3 — where does the decimal point go? (a) 1.02 (b) 10.2 (c) 0.0102 (d) 0.102
  9. 9.1.8 × 0.7 — where does the decimal point go? (a) 0.126 (b) 1.26 (c) 12.6 (d) 0.0126
  10. 10.6.3 × 4 — where does the decimal point go? (a) 0.252 (b) 252 (c) 25.2 (d) 2.52
  11. 11.0.36 × 19 — where does the decimal point go? (a) 0.0684 (b) 0.684 (c) 68.4 (d) 6.84
  12. 12.5.9 × 6 — where does the decimal point go? (a) 35.4 (b) 0.354 (c) 3.54 (d) 354
  13. 13.2.5 × 0.7 — where does the decimal point go? (a) 1.75 (b) 17.5 (c) 0.0175 (d) 0.175
  14. 14.0.77 × 4 — where does the decimal point go? (a) 0.308 (b) 3.08 (c) 30.8 (d) 0.0308
  15. 15.0.84 × 3 — where does the decimal point go? (a) 0.252 (b) 0.0252 (c) 25.2 (d) 2.52
  16. 16.0.31 × 4.5 — where does the decimal point go? (a) 13.95 (b) 1.395 (c) 0.01395 (d) 0.1395
  17. 17.0.89 × 6 — where does the decimal point go? (a) 5.34 (b) 0.0534 (c) 0.534 (d) 53.4
  18. 18.0.81 × 5 — where does the decimal point go? (a) 0.405 (b) 0.0405 (c) 4.05 (d) 40.5
  19. 19.0.78 × 11 — where does the decimal point go? (a) 0.858 (b) 85.8 (c) 0.0858 (d) 8.58
  20. 20.4.7 × 5 — where does the decimal point go? (a) 0.235 (b) 235 (c) 2.35 (d) 23.5
  21. 21.7.8 × 3.7 — where does the decimal point go? (a) 0.2886 (b) 2.886 (c) 28.86 (d) 288.6
  22. 22.6.7 × 1.7 — where does the decimal point go? (a) 1.139 (b) 0.1139 (c) 11.39 (d) 113.9
  23. 23.0.15 × 15 — where does the decimal point go? (a) 22.5 (b) 0.225 (c) 0.0225 (d) 2.25
  24. 24.9.2 × 0.8 — where does the decimal point go? (a) 0.0736 (b) 73.6 (c) 0.736 (d) 7.36
  25. 25.3.6 × 0.2 — where does the decimal point go? (a) 0.72 (b) 7.2 (c) 0.072 (d) 0.0072
  26. 26.0.69 × 9 — where does the decimal point go? (a) 6.21 (b) 0.621 (c) 0.0621 (d) 62.1
  27. 27.0.47 × 6 — where does the decimal point go? (a) 2.82 (b) 0.282 (c) 28.2 (d) 0.0282
  28. 28.0.84 × 13 — where does the decimal point go? (a) 0.1092 (b) 1.092 (c) 109.2 (d) 10.92
  29. 29.4.9 × 4 — where does the decimal point go? (a) 196 (b) 19.6 (c) 0.196 (d) 1.96
  30. 30.0.79 × 7 — where does the decimal point go? (a) 5.53 (b) 0.0553 (c) 55.3 (d) 0.553
  31. 31.3.5 × 7 — where does the decimal point go? (a) 24.5 (b) 2.45 (c) 245 (d) 0.245
  32. 32.3.6 × 2.4 — where does the decimal point go? (a) 8.64 (b) 0.0864 (c) 86.4 (d) 0.864
  33. 33.1.2 × 43 — where does the decimal point go? (a) 0.516 (b) 51.6 (c) 5.16 (d) 516
  34. 34.0.94 × 4.1 — where does the decimal point go? (a) 0.03854 (b) 38.54 (c) 3.854 (d) 0.3854
  35. 35.0.38 × 0.6 — where does the decimal point go? (a) 0.00228 (b) 0.228 (c) 0.0228 (d) 2.28
  36. 36.2.4 × 0.2 — where does the decimal point go? (a) 0.48 (b) 4.8 (c) 0.048 (d) 0.0048
  37. 37.1.8 × 0.4 — where does the decimal point go? (a) 0.0072 (b) 0.072 (c) 7.2 (d) 0.72
  38. 38.0.41 × 9 — where does the decimal point go? (a) 3.69 (b) 0.369 (c) 0.0369 (d) 36.9
  39. 39.0.52 × 0.3 — where does the decimal point go? (a) 1.56 (b) 0.0156 (c) 0.00156 (d) 0.156
  40. 40.4.1 × 5 — where does the decimal point go? (a) 2.05 (b) 0.205 (c) 205 (d) 20.5

Answer key

  1. 0.216
  2. 3.36
  3. 20.7
  4. 190.9
  5. 152.5
  6. 159.3
  7. 31.98
  8. 1.02
  9. 1.26
  10. 25.2
  11. 6.84
  12. 35.4
  13. 1.75
  14. 3.08
  15. 2.52
  16. 1.395
  17. 5.34
  18. 4.05
  19. 8.58
  20. 23.5
  21. 28.86
  22. 11.39
  23. 2.25
  24. 7.36
  25. 0.72
  26. 6.21
  27. 2.82
  28. 10.92
  29. 19.6
  30. 5.53
  31. 24.5
  32. 8.64
  33. 51.6
  34. 3.854
  35. 0.228
  36. 0.48
  37. 0.72
  38. 3.69
  39. 0.156
  40. 20.5

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