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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 571 · 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. 1.6.4 × 2 — where does the decimal point go? (a) 0.128 (b) 128 (c) 1.28 (d) 12.8
  2. 2.9.1 × 0.5 — where does the decimal point go? (a) 4.55 (b) 45.5 (c) 0.0455 (d) 0.455
  3. 3.0.23 × 5 — where does the decimal point go? (a) 1.15 (b) 0.0115 (c) 11.5 (d) 0.115
  4. 4.0.83 × 2 — where does the decimal point go? (a) 0.166 (b) 16.6 (c) 0.0166 (d) 1.66
  5. 5.2.2 × 23 — where does the decimal point go? (a) 50.6 (b) 506 (c) 0.506 (d) 5.06
  6. 6.3.4 × 2.2 — where does the decimal point go? (a) 74.8 (b) 0.748 (c) 0.0748 (d) 7.48
  7. 7.3.6 × 6 — where does the decimal point go? (a) 2.16 (b) 21.6 (c) 216 (d) 0.216
  8. 8.4.3 × 48 — where does the decimal point go? (a) 20.64 (b) 2.064 (c) 2064 (d) 206.4
  9. 9.0.57 × 3.5 — where does the decimal point go? (a) 0.01995 (b) 1.995 (c) 0.1995 (d) 19.95
  10. 10.3.6 × 4 — where does the decimal point go? (a) 14.4 (b) 1.44 (c) 0.144 (d) 144
  11. 11.0.79 × 0.5 — where does the decimal point go? (a) 0.0395 (b) 3.95 (c) 0.00395 (d) 0.395
  12. 12.6.8 × 3 — where does the decimal point go? (a) 204 (b) 2.04 (c) 20.4 (d) 0.204
  13. 13.0.43 × 0.4 — where does the decimal point go? (a) 0.00172 (b) 1.72 (c) 0.172 (d) 0.0172
  14. 14.0.36 × 19 — where does the decimal point go? (a) 0.0684 (b) 0.684 (c) 6.84 (d) 68.4
  15. 15.9.4 × 43 — where does the decimal point go? (a) 404.2 (b) 4.042 (c) 40.42 (d) 4042
  16. 16.0.77 × 0.8 — where does the decimal point go? (a) 0.00616 (b) 0.0616 (c) 6.16 (d) 0.616
  17. 17.0.23 × 39 — where does the decimal point go? (a) 89.7 (b) 0.0897 (c) 8.97 (d) 0.897
  18. 18.0.85 × 3.1 — where does the decimal point go? (a) 0.02635 (b) 2.635 (c) 26.35 (d) 0.2635
  19. 19.0.49 × 31 — where does the decimal point go? (a) 151.9 (b) 0.1519 (c) 15.19 (d) 1.519
  20. 20.0.35 × 0.7 — where does the decimal point go? (a) 0.00245 (b) 2.45 (c) 0.0245 (d) 0.245
  21. 21.0.13 × 0.3 — where does the decimal point go? (a) 0.039 (b) 0.00039 (c) 0.0039 (d) 0.39
  22. 22.1.2 × 14 — where does the decimal point go? (a) 168 (b) 1.68 (c) 0.168 (d) 16.8
  23. 23.6.9 × 0.2 — where does the decimal point go? (a) 0.0138 (b) 13.8 (c) 0.138 (d) 1.38
  24. 24.3.7 × 0.8 — where does the decimal point go? (a) 2.96 (b) 0.0296 (c) 0.296 (d) 29.6
  25. 25.0.53 × 24 — where does the decimal point go? (a) 0.1272 (b) 127.2 (c) 1.272 (d) 12.72
  26. 26.0.49 × 2 — where does the decimal point go? (a) 0.098 (b) 0.0098 (c) 0.98 (d) 9.8
  27. 27.0.62 × 43 — where does the decimal point go? (a) 266.6 (b) 0.2666 (c) 26.66 (d) 2.666
  28. 28.0.18 × 4 — where does the decimal point go? (a) 0.072 (b) 0.0072 (c) 0.72 (d) 7.2
  29. 29.9.1 × 13 — where does the decimal point go? (a) 1.183 (b) 118.3 (c) 1183 (d) 11.83
  30. 30.3.9 × 0.9 — where does the decimal point go? (a) 35.1 (b) 0.351 (c) 3.51 (d) 0.0351
  31. 31.4.7 × 2 — where does the decimal point go? (a) 94 (b) 9.4 (c) 0.094 (d) 0.94
  32. 32.0.17 × 3.4 — where does the decimal point go? (a) 0.0578 (b) 0.00578 (c) 0.578 (d) 5.78
  33. 33.4.1 × 0.6 — where does the decimal point go? (a) 2.46 (b) 0.246 (c) 0.0246 (d) 24.6
  34. 34.6.1 × 1.7 — where does the decimal point go? (a) 103.7 (b) 1.037 (c) 10.37 (d) 0.1037
  35. 35.0.86 × 6 — where does the decimal point go? (a) 51.6 (b) 0.0516 (c) 5.16 (d) 0.516
  36. 36.0.28 × 7 — where does the decimal point go? (a) 19.6 (b) 1.96 (c) 0.196 (d) 0.0196
  37. 37.0.92 × 41 — where does the decimal point go? (a) 377.2 (b) 3.772 (c) 0.3772 (d) 37.72
  38. 38.3.6 × 32 — where does the decimal point go? (a) 1.152 (b) 1152 (c) 115.2 (d) 11.52
  39. 39.3.5 × 4.3 — where does the decimal point go? (a) 15.05 (b) 1.505 (c) 150.5 (d) 0.1505
  40. 40.0.93 × 7 — where does the decimal point go? (a) 0.0651 (b) 6.51 (c) 65.1 (d) 0.651

Answer key

  1. 12.8
  2. 4.55
  3. 1.15
  4. 1.66
  5. 50.6
  6. 7.48
  7. 21.6
  8. 206.4
  9. 1.995
  10. 14.4
  11. 0.395
  12. 20.4
  13. 0.172
  14. 6.84
  15. 404.2
  16. 0.616
  17. 8.97
  18. 2.635
  19. 15.19
  20. 0.245
  21. 0.039
  22. 16.8
  23. 1.38
  24. 2.96
  25. 12.72
  26. 0.98
  27. 26.66
  28. 0.72
  29. 118.3
  30. 3.51
  31. 9.4
  32. 0.578
  33. 2.46
  34. 10.37
  35. 5.16
  36. 1.96
  37. 37.72
  38. 115.2
  39. 15.05
  40. 6.51

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