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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 450 · 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. 1.6.6 × 28 — where does the decimal point go? (a) 18.48 (b) 1.848 (c) 1848 (d) 184.8
  2. 2.0.77 × 3 — where does the decimal point go? (a) 23.1 (b) 0.231 (c) 0.0231 (d) 2.31
  3. 3.1.8 × 6 — where does the decimal point go? (a) 10.8 (b) 108 (c) 0.108 (d) 1.08
  4. 4.0.33 × 4 — where does the decimal point go? (a) 1.32 (b) 0.132 (c) 13.2 (d) 0.0132
  5. 5.3.7 × 2 — where does the decimal point go? (a) 0.074 (b) 7.4 (c) 74 (d) 0.74
  6. 6.9.4 × 4 — where does the decimal point go? (a) 0.376 (b) 37.6 (c) 3.76 (d) 376
  7. 7.0.17 × 11 — where does the decimal point go? (a) 18.7 (b) 0.0187 (c) 0.187 (d) 1.87
  8. 8.6.7 × 6 — where does the decimal point go? (a) 0.402 (b) 40.2 (c) 402 (d) 4.02
  9. 9.1.2 × 0.8 — where does the decimal point go? (a) 0.096 (b) 0.0096 (c) 0.96 (d) 9.6
  10. 10.0.36 × 46 — where does the decimal point go? (a) 16.56 (b) 1.656 (c) 0.1656 (d) 165.6
  11. 11.2.8 × 2.2 — where does the decimal point go? (a) 6.16 (b) 61.6 (c) 0.616 (d) 0.0616
  12. 12.0.37 × 8 — where does the decimal point go? (a) 29.6 (b) 2.96 (c) 0.0296 (d) 0.296
  13. 13.2.6 × 7 — where does the decimal point go? (a) 18.2 (b) 1.82 (c) 0.182 (d) 182
  14. 14.2.5 × 3 — where does the decimal point go? (a) 0.75 (b) 7.5 (c) 75 (d) 0.075
  15. 15.0.37 × 6 — where does the decimal point go? (a) 2.22 (b) 0.0222 (c) 22.2 (d) 0.222
  16. 16.8.2 × 39 — where does the decimal point go? (a) 3.198 (b) 319.8 (c) 31.98 (d) 3198
  17. 17.1.2 × 3.4 — where does the decimal point go? (a) 0.0408 (b) 4.08 (c) 0.408 (d) 40.8
  18. 18.9.3 × 8 — where does the decimal point go? (a) 7.44 (b) 74.4 (c) 0.744 (d) 744
  19. 19.1.2 × 12 — where does the decimal point go? (a) 144 (b) 1.44 (c) 0.144 (d) 14.4
  20. 20.0.54 × 0.8 — where does the decimal point go? (a) 4.32 (b) 0.00432 (c) 0.432 (d) 0.0432
  21. 21.0.73 × 1.9 — where does the decimal point go? (a) 0.1387 (b) 1.387 (c) 13.87 (d) 0.01387
  22. 22.0.33 × 7 — where does the decimal point go? (a) 23.1 (b) 0.231 (c) 2.31 (d) 0.0231
  23. 23.1.8 × 43 — where does the decimal point go? (a) 7.74 (b) 0.774 (c) 77.4 (d) 774
  24. 24.7.9 × 0.4 — where does the decimal point go? (a) 0.0316 (b) 0.316 (c) 31.6 (d) 3.16
  25. 25.0.62 × 0.2 — where does the decimal point go? (a) 0.124 (b) 0.00124 (c) 1.24 (d) 0.0124
  26. 26.0.12 × 0.3 — where does the decimal point go? (a) 0.00036 (b) 0.36 (c) 0.036 (d) 0.0036
  27. 27.0.32 × 24 — where does the decimal point go? (a) 0.0768 (b) 76.8 (c) 7.68 (d) 0.768
  28. 28.4.5 × 35 — where does the decimal point go? (a) 15.75 (b) 1575 (c) 157.5 (d) 1.575
  29. 29.0.69 × 6 — where does the decimal point go? (a) 4.14 (b) 0.414 (c) 41.4 (d) 0.0414
  30. 30.4.6 × 2 — where does the decimal point go? (a) 0.92 (b) 92 (c) 9.2 (d) 0.092
  31. 31.0.52 × 4 — where does the decimal point go? (a) 0.208 (b) 0.0208 (c) 20.8 (d) 2.08
  32. 32.0.14 × 7 — where does the decimal point go? (a) 0.98 (b) 9.8 (c) 0.0098 (d) 0.098
  33. 33.0.94 × 2.1 — where does the decimal point go? (a) 1.974 (b) 0.1974 (c) 19.74 (d) 0.01974
  34. 34.0.27 × 7 — where does the decimal point go? (a) 0.0189 (b) 0.189 (c) 18.9 (d) 1.89
  35. 35.1.8 × 0.9 — where does the decimal point go? (a) 1.62 (b) 0.162 (c) 0.0162 (d) 16.2
  36. 36.1.4 × 0.9 — where does the decimal point go? (a) 1.26 (b) 0.126 (c) 12.6 (d) 0.0126
  37. 37.0.93 × 0.8 — where does the decimal point go? (a) 0.0744 (b) 0.00744 (c) 7.44 (d) 0.744
  38. 38.3.5 × 9 — where does the decimal point go? (a) 0.315 (b) 315 (c) 31.5 (d) 3.15
  39. 39.0.69 × 3 — where does the decimal point go? (a) 2.07 (b) 20.7 (c) 0.0207 (d) 0.207
  40. 40.0.97 × 42 — where does the decimal point go? (a) 4.074 (b) 40.74 (c) 407.4 (d) 0.4074

Answer key

  1. 184.8
  2. 2.31
  3. 10.8
  4. 1.32
  5. 7.4
  6. 37.6
  7. 1.87
  8. 40.2
  9. 0.96
  10. 16.56
  11. 6.16
  12. 2.96
  13. 18.2
  14. 7.5
  15. 2.22
  16. 319.8
  17. 4.08
  18. 74.4
  19. 14.4
  20. 0.432
  21. 1.387
  22. 2.31
  23. 77.4
  24. 3.16
  25. 0.124
  26. 0.036
  27. 7.68
  28. 157.5
  29. 4.14
  30. 9.2
  31. 2.08
  32. 0.98
  33. 1.974
  34. 1.89
  35. 1.62
  36. 1.26
  37. 0.744
  38. 31.5
  39. 2.07
  40. 40.74

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