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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 942 · 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. 1.0.49 × 0.8 — where does the decimal point go? (a) 3.92 (b) 0.0392 (c) 0.00392 (d) 0.392
  2. 2.0.14 × 6 — where does the decimal point go? (a) 8.4 (b) 0.084 (c) 0.0084 (d) 0.84
  3. 3.0.18 × 4 — where does the decimal point go? (a) 7.2 (b) 0.072 (c) 0.0072 (d) 0.72
  4. 4.0.73 × 5 — where does the decimal point go? (a) 3.65 (b) 0.365 (c) 36.5 (d) 0.0365
  5. 5.0.82 × 11 — where does the decimal point go? (a) 9.02 (b) 0.0902 (c) 0.902 (d) 90.2
  6. 6.0.51 × 2 — where does the decimal point go? (a) 0.102 (b) 10.2 (c) 0.0102 (d) 1.02
  7. 7.0.14 × 0.3 — where does the decimal point go? (a) 0.0042 (b) 0.00042 (c) 0.042 (d) 0.42
  8. 8.0.91 × 0.8 — where does the decimal point go? (a) 0.00728 (b) 0.0728 (c) 7.28 (d) 0.728
  9. 9.7.6 × 6 — where does the decimal point go? (a) 456 (b) 45.6 (c) 0.456 (d) 4.56
  10. 10.0.52 × 2.2 — where does the decimal point go? (a) 0.01144 (b) 0.1144 (c) 1.144 (d) 11.44
  11. 11.0.61 × 3 — where does the decimal point go? (a) 0.183 (b) 18.3 (c) 0.0183 (d) 1.83
  12. 12.7.5 × 35 — where does the decimal point go? (a) 262.5 (b) 2.625 (c) 26.25 (d) 2625
  13. 13.0.71 × 35 — where does the decimal point go? (a) 0.2485 (b) 248.5 (c) 2.485 (d) 24.85
  14. 14.4.8 × 13 — where does the decimal point go? (a) 0.624 (b) 6.24 (c) 624 (d) 62.4
  15. 15.4.5 × 23 — where does the decimal point go? (a) 10.35 (b) 1.035 (c) 103.5 (d) 1035
  16. 16.7.4 × 11 — where does the decimal point go? (a) 0.814 (b) 814 (c) 8.14 (d) 81.4
  17. 17.1.2 × 9 — where does the decimal point go? (a) 10.8 (b) 108 (c) 1.08 (d) 0.108
  18. 18.0.85 × 3.1 — where does the decimal point go? (a) 0.02635 (b) 2.635 (c) 0.2635 (d) 26.35
  19. 19.3.9 × 3 — where does the decimal point go? (a) 11.7 (b) 0.117 (c) 117 (d) 1.17
  20. 20.9.3 × 28 — where does the decimal point go? (a) 26.04 (b) 2604 (c) 260.4 (d) 2.604
  21. 21.0.54 × 0.4 — where does the decimal point go? (a) 0.216 (b) 2.16 (c) 0.00216 (d) 0.0216
  22. 22.0.21 × 42 — where does the decimal point go? (a) 0.882 (b) 88.2 (c) 0.0882 (d) 8.82
  23. 23.3.3 × 1.8 — where does the decimal point go? (a) 59.4 (b) 0.0594 (c) 0.594 (d) 5.94
  24. 24.3.4 × 23 — where does the decimal point go? (a) 7.82 (b) 78.2 (c) 0.782 (d) 782
  25. 25.1.7 × 3 — where does the decimal point go? (a) 0.051 (b) 0.51 (c) 51 (d) 5.1
  26. 26.0.37 × 0.2 — where does the decimal point go? (a) 0.00074 (b) 0.74 (c) 0.074 (d) 0.0074
  27. 27.0.56 × 6 — where does the decimal point go? (a) 33.6 (b) 0.0336 (c) 3.36 (d) 0.336
  28. 28.9.9 × 2 — where does the decimal point go? (a) 198 (b) 0.198 (c) 1.98 (d) 19.8
  29. 29.5.8 × 0.4 — where does the decimal point go? (a) 23.2 (b) 0.232 (c) 2.32 (d) 0.0232
  30. 30.4.1 × 0.8 — where does the decimal point go? (a) 0.328 (b) 32.8 (c) 0.0328 (d) 3.28
  31. 31.0.43 × 0.8 — where does the decimal point go? (a) 3.44 (b) 0.0344 (c) 0.344 (d) 0.00344
  32. 32.0.96 × 1.7 — where does the decimal point go? (a) 0.01632 (b) 1.632 (c) 16.32 (d) 0.1632
  33. 33.4.2 × 8 — where does the decimal point go? (a) 336 (b) 3.36 (c) 0.336 (d) 33.6
  34. 34.2.9 × 1.4 — where does the decimal point go? (a) 0.406 (b) 4.06 (c) 0.0406 (d) 40.6
  35. 35.7.5 × 15 — where does the decimal point go? (a) 11.25 (b) 1.125 (c) 1125 (d) 112.5
  36. 36.0.78 × 12 — where does the decimal point go? (a) 0.0936 (b) 0.936 (c) 9.36 (d) 93.6
  37. 37.0.69 × 2 — where does the decimal point go? (a) 1.38 (b) 0.138 (c) 13.8 (d) 0.0138
  38. 38.2.6 × 47 — where does the decimal point go? (a) 122.2 (b) 1.222 (c) 12.22 (d) 1222
  39. 39.0.38 × 0.2 — where does the decimal point go? (a) 0.0076 (b) 0.00076 (c) 0.076 (d) 0.76
  40. 40.8.9 × 44 — where does the decimal point go? (a) 3916 (b) 39.16 (c) 3.916 (d) 391.6

Answer key

  1. 0.392
  2. 0.84
  3. 0.72
  4. 3.65
  5. 9.02
  6. 1.02
  7. 0.042
  8. 0.728
  9. 45.6
  10. 1.144
  11. 1.83
  12. 262.5
  13. 24.85
  14. 62.4
  15. 103.5
  16. 81.4
  17. 10.8
  18. 2.635
  19. 11.7
  20. 260.4
  21. 0.216
  22. 8.82
  23. 5.94
  24. 78.2
  25. 5.1
  26. 0.074
  27. 3.36
  28. 19.8
  29. 2.32
  30. 3.28
  31. 0.344
  32. 1.632
  33. 33.6
  34. 4.06
  35. 112.5
  36. 9.36
  37. 1.38
  38. 122.2
  39. 0.076
  40. 391.6

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