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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 849 · 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. 1.4.1 × 0.4 — where does the decimal point go? (a) 16.4 (b) 1.64 (c) 0.164 (d) 0.0164
  2. 2.0.89 × 3.8 — where does the decimal point go? (a) 33.82 (b) 3.382 (c) 0.3382 (d) 0.03382
  3. 3.0.29 × 0.7 — where does the decimal point go? (a) 0.00203 (b) 2.03 (c) 0.0203 (d) 0.203
  4. 4.0.57 × 3.2 — where does the decimal point go? (a) 1.824 (b) 18.24 (c) 0.1824 (d) 0.01824
  5. 5.7.2 × 0.2 — where does the decimal point go? (a) 1.44 (b) 0.0144 (c) 0.144 (d) 14.4
  6. 6.0.14 × 2 — where does the decimal point go? (a) 0.0028 (b) 0.028 (c) 2.8 (d) 0.28
  7. 7.0.52 × 11 — where does the decimal point go? (a) 0.0572 (b) 0.572 (c) 5.72 (d) 57.2
  8. 8.0.19 × 0.9 — where does the decimal point go? (a) 0.0171 (b) 1.71 (c) 0.171 (d) 0.00171
  9. 9.0.43 × 4.9 — where does the decimal point go? (a) 21.07 (b) 0.02107 (c) 2.107 (d) 0.2107
  10. 10.7.8 × 0.9 — where does the decimal point go? (a) 7.02 (b) 0.0702 (c) 0.702 (d) 70.2
  11. 11.3.6 × 7 — where does the decimal point go? (a) 2.52 (b) 25.2 (c) 0.252 (d) 252
  12. 12.0.22 × 7 — where does the decimal point go? (a) 1.54 (b) 0.154 (c) 15.4 (d) 0.0154
  13. 13.0.57 × 3 — where does the decimal point go? (a) 17.1 (b) 1.71 (c) 0.171 (d) 0.0171
  14. 14.7.8 × 3.3 — where does the decimal point go? (a) 257.4 (b) 2.574 (c) 0.2574 (d) 25.74
  15. 15.9.4 × 0.3 — where does the decimal point go? (a) 0.0282 (b) 28.2 (c) 2.82 (d) 0.282
  16. 16.0.33 × 44 — where does the decimal point go? (a) 14.52 (b) 145.2 (c) 1.452 (d) 0.1452
  17. 17.0.41 × 0.7 — where does the decimal point go? (a) 0.00287 (b) 0.0287 (c) 2.87 (d) 0.287
  18. 18.0.66 × 4 — where does the decimal point go? (a) 0.264 (b) 2.64 (c) 0.0264 (d) 26.4
  19. 19.6.3 × 12 — where does the decimal point go? (a) 75.6 (b) 756 (c) 7.56 (d) 0.756
  20. 20.0.19 × 7 — where does the decimal point go? (a) 0.133 (b) 13.3 (c) 0.0133 (d) 1.33
  21. 21.8.8 × 0.9 — where does the decimal point go? (a) 7.92 (b) 0.0792 (c) 0.792 (d) 79.2
  22. 22.3.1 × 35 — where does the decimal point go? (a) 108.5 (b) 1085 (c) 10.85 (d) 1.085
  23. 23.1.3 × 9 — where does the decimal point go? (a) 1.17 (b) 117 (c) 0.117 (d) 11.7
  24. 24.9.7 × 1.9 — where does the decimal point go? (a) 1.843 (b) 0.1843 (c) 18.43 (d) 184.3
  25. 25.0.63 × 6 — where does the decimal point go? (a) 3.78 (b) 0.0378 (c) 37.8 (d) 0.378
  26. 26.7.2 × 0.9 — where does the decimal point go? (a) 0.0648 (b) 0.648 (c) 64.8 (d) 6.48
  27. 27.0.86 × 13 — where does the decimal point go? (a) 1.118 (b) 11.18 (c) 0.1118 (d) 111.8
  28. 28.1.4 × 43 — where does the decimal point go? (a) 60.2 (b) 0.602 (c) 6.02 (d) 602
  29. 29.8.1 × 2 — where does the decimal point go? (a) 1.62 (b) 0.162 (c) 162 (d) 16.2
  30. 30.0.89 × 44 — where does the decimal point go? (a) 39.16 (b) 0.3916 (c) 391.6 (d) 3.916
  31. 31.6.8 × 4.6 — where does the decimal point go? (a) 3.128 (b) 312.8 (c) 0.3128 (d) 31.28
  32. 32.8.6 × 9 — where does the decimal point go? (a) 774 (b) 77.4 (c) 7.74 (d) 0.774
  33. 33.3.3 × 7 — where does the decimal point go? (a) 23.1 (b) 0.231 (c) 2.31 (d) 231
  34. 34.4.2 × 2 — where does the decimal point go? (a) 8.4 (b) 0.84 (c) 0.084 (d) 84
  35. 35.8.7 × 2 — where does the decimal point go? (a) 17.4 (b) 174 (c) 1.74 (d) 0.174
  36. 36.5.4 × 8 — where does the decimal point go? (a) 43.2 (b) 0.432 (c) 432 (d) 4.32
  37. 37.0.37 × 3.3 — where does the decimal point go? (a) 0.1221 (b) 0.01221 (c) 1.221 (d) 12.21
  38. 38.8.7 × 0.9 — where does the decimal point go? (a) 78.3 (b) 7.83 (c) 0.783 (d) 0.0783
  39. 39.5.9 × 1.4 — where does the decimal point go? (a) 0.826 (b) 82.6 (c) 0.0826 (d) 8.26
  40. 40.0.24 × 4.4 — where does the decimal point go? (a) 10.56 (b) 1.056 (c) 0.01056 (d) 0.1056

Answer key

  1. 1.64
  2. 3.382
  3. 0.203
  4. 1.824
  5. 1.44
  6. 0.28
  7. 5.72
  8. 0.171
  9. 2.107
  10. 7.02
  11. 25.2
  12. 1.54
  13. 1.71
  14. 25.74
  15. 2.82
  16. 14.52
  17. 0.287
  18. 2.64
  19. 75.6
  20. 1.33
  21. 7.92
  22. 108.5
  23. 11.7
  24. 18.43
  25. 3.78
  26. 6.48
  27. 11.18
  28. 60.2
  29. 16.2
  30. 39.16
  31. 31.28
  32. 77.4
  33. 23.1
  34. 8.4
  35. 17.4
  36. 43.2
  37. 1.221
  38. 7.83
  39. 8.26
  40. 1.056

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