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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 538 · 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. 1.8.6 × 47 — where does the decimal point go? (a) 4042 (b) 4.042 (c) 404.2 (d) 40.42
  2. 2.7.1 × 6 — where does the decimal point go? (a) 426 (b) 0.426 (c) 42.6 (d) 4.26
  3. 3.6.6 × 2 — where does the decimal point go? (a) 13.2 (b) 1.32 (c) 0.132 (d) 132
  4. 4.1.8 × 0.3 — where does the decimal point go? (a) 0.054 (b) 0.54 (c) 5.4 (d) 0.0054
  5. 5.3.3 × 4.6 — where does the decimal point go? (a) 0.1518 (b) 15.18 (c) 1.518 (d) 151.8
  6. 6.0.21 × 2 — where does the decimal point go? (a) 0.042 (b) 4.2 (c) 0.0042 (d) 0.42
  7. 7.0.36 × 6 — where does the decimal point go? (a) 21.6 (b) 0.216 (c) 0.0216 (d) 2.16
  8. 8.0.65 × 5 — where does the decimal point go? (a) 3.25 (b) 0.0325 (c) 32.5 (d) 0.325
  9. 9.2.3 × 1.9 — where does the decimal point go? (a) 4.37 (b) 0.0437 (c) 43.7 (d) 0.437
  10. 10.8.6 × 3 — where does the decimal point go? (a) 0.258 (b) 258 (c) 25.8 (d) 2.58
  11. 11.0.66 × 3.8 — where does the decimal point go? (a) 0.02508 (b) 2.508 (c) 0.2508 (d) 25.08
  12. 12.6.1 × 25 — where does the decimal point go? (a) 1525 (b) 152.5 (c) 15.25 (d) 1.525
  13. 13.7.7 × 0.5 — where does the decimal point go? (a) 38.5 (b) 3.85 (c) 0.0385 (d) 0.385
  14. 14.4.9 × 0.6 — where does the decimal point go? (a) 2.94 (b) 0.0294 (c) 0.294 (d) 29.4
  15. 15.0.95 × 0.9 — where does the decimal point go? (a) 0.0855 (b) 0.855 (c) 0.00855 (d) 8.55
  16. 16.0.87 × 1.5 — where does the decimal point go? (a) 13.05 (b) 1.305 (c) 0.1305 (d) 0.01305
  17. 17.0.22 × 0.6 — where does the decimal point go? (a) 0.0132 (b) 1.32 (c) 0.132 (d) 0.00132
  18. 18.0.85 × 4.9 — where does the decimal point go? (a) 4.165 (b) 0.04165 (c) 0.4165 (d) 41.65
  19. 19.1.9 × 3 — where does the decimal point go? (a) 5.7 (b) 0.57 (c) 0.057 (d) 57
  20. 20.0.16 × 0.2 — where does the decimal point go? (a) 0.032 (b) 0.00032 (c) 0.0032 (d) 0.32
  21. 21.5.5 × 3.7 — where does the decimal point go? (a) 20.35 (b) 2.035 (c) 0.2035 (d) 203.5
  22. 22.0.42 × 44 — where does the decimal point go? (a) 0.1848 (b) 1.848 (c) 184.8 (d) 18.48
  23. 23.0.26 × 7 — where does the decimal point go? (a) 1.82 (b) 0.0182 (c) 18.2 (d) 0.182
  24. 24.0.91 × 15 — where does the decimal point go? (a) 136.5 (b) 0.1365 (c) 1.365 (d) 13.65
  25. 25.5.5 × 5 — where does the decimal point go? (a) 27.5 (b) 2.75 (c) 275 (d) 0.275
  26. 26.5.3 × 1.7 — where does the decimal point go? (a) 0.0901 (b) 9.01 (c) 0.901 (d) 90.1
  27. 27.3.2 × 0.8 — where does the decimal point go? (a) 0.256 (b) 0.0256 (c) 2.56 (d) 25.6
  28. 28.0.89 × 1.8 — where does the decimal point go? (a) 16.02 (b) 1.602 (c) 0.1602 (d) 0.01602
  29. 29.0.58 × 0.8 — where does the decimal point go? (a) 4.64 (b) 0.00464 (c) 0.0464 (d) 0.464
  30. 30.5.7 × 3.3 — where does the decimal point go? (a) 18.81 (b) 188.1 (c) 0.1881 (d) 1.881
  31. 31.0.13 × 5 — where does the decimal point go? (a) 0.0065 (b) 6.5 (c) 0.65 (d) 0.065
  32. 32.0.56 × 0.3 — where does the decimal point go? (a) 0.168 (b) 0.0168 (c) 1.68 (d) 0.00168
  33. 33.0.94 × 0.6 — where does the decimal point go? (a) 0.564 (b) 5.64 (c) 0.0564 (d) 0.00564
  34. 34.0.18 × 8 — where does the decimal point go? (a) 0.0144 (b) 14.4 (c) 0.144 (d) 1.44
  35. 35.0.62 × 0.2 — where does the decimal point go? (a) 0.00124 (b) 0.0124 (c) 1.24 (d) 0.124
  36. 36.8.4 × 0.2 — where does the decimal point go? (a) 1.68 (b) 0.168 (c) 0.0168 (d) 16.8
  37. 37.7.3 × 2.4 — where does the decimal point go? (a) 0.1752 (b) 1.752 (c) 17.52 (d) 175.2
  38. 38.6.2 × 0.8 — where does the decimal point go? (a) 0.496 (b) 4.96 (c) 0.0496 (d) 49.6
  39. 39.5.9 × 2.7 — where does the decimal point go? (a) 159.3 (b) 1.593 (c) 0.1593 (d) 15.93
  40. 40.7.4 × 29 — where does the decimal point go? (a) 2146 (b) 2.146 (c) 214.6 (d) 21.46

Answer key

  1. 404.2
  2. 42.6
  3. 13.2
  4. 0.54
  5. 15.18
  6. 0.42
  7. 2.16
  8. 3.25
  9. 4.37
  10. 25.8
  11. 2.508
  12. 152.5
  13. 3.85
  14. 2.94
  15. 0.855
  16. 1.305
  17. 0.132
  18. 4.165
  19. 5.7
  20. 0.032
  21. 20.35
  22. 18.48
  23. 1.82
  24. 13.65
  25. 27.5
  26. 9.01
  27. 2.56
  28. 1.602
  29. 0.464
  30. 18.81
  31. 0.65
  32. 0.168
  33. 0.564
  34. 1.44
  35. 0.124
  36. 1.68
  37. 17.52
  38. 4.96
  39. 15.93
  40. 214.6

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