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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 970 · 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 × 3.8 — where does the decimal point go? (a) 25.08 (b) 2.508 (c) 0.2508 (d) 250.8
  2. 2.0.12 × 0.3 — where does the decimal point go? (a) 0.0036 (b) 0.036 (c) 0.00036 (d) 0.36
  3. 3.0.88 × 4 — where does the decimal point go? (a) 3.52 (b) 0.0352 (c) 0.352 (d) 35.2
  4. 4.4.5 × 5 — where does the decimal point go? (a) 225 (b) 2.25 (c) 0.225 (d) 22.5
  5. 5.0.88 × 3 — where does the decimal point go? (a) 2.64 (b) 0.264 (c) 0.0264 (d) 26.4
  6. 6.0.65 × 49 — where does the decimal point go? (a) 318.5 (b) 0.3185 (c) 3.185 (d) 31.85
  7. 7.0.71 × 0.2 — where does the decimal point go? (a) 0.0142 (b) 0.00142 (c) 1.42 (d) 0.142
  8. 8.7.5 × 45 — where does the decimal point go? (a) 337.5 (b) 33.75 (c) 3375 (d) 3.375
  9. 9.0.86 × 0.3 — where does the decimal point go? (a) 2.58 (b) 0.258 (c) 0.0258 (d) 0.00258
  10. 10.9.7 × 0.6 — where does the decimal point go? (a) 0.0582 (b) 0.582 (c) 58.2 (d) 5.82
  11. 11.7.7 × 0.9 — where does the decimal point go? (a) 0.693 (b) 6.93 (c) 0.0693 (d) 69.3
  12. 12.0.98 × 3.1 — where does the decimal point go? (a) 3.038 (b) 0.03038 (c) 30.38 (d) 0.3038
  13. 13.3.2 × 0.4 — where does the decimal point go? (a) 0.128 (b) 1.28 (c) 0.0128 (d) 12.8
  14. 14.2.9 × 4.1 — where does the decimal point go? (a) 0.1189 (b) 11.89 (c) 1.189 (d) 118.9
  15. 15.3.4 × 36 — where does the decimal point go? (a) 12.24 (b) 122.4 (c) 1224 (d) 1.224
  16. 16.0.54 × 16 — where does the decimal point go? (a) 86.4 (b) 0.0864 (c) 8.64 (d) 0.864
  17. 17.0.55 × 0.5 — where does the decimal point go? (a) 0.275 (b) 2.75 (c) 0.00275 (d) 0.0275
  18. 18.1.8 × 7 — where does the decimal point go? (a) 1.26 (b) 12.6 (c) 126 (d) 0.126
  19. 19.3.3 × 0.5 — where does the decimal point go? (a) 1.65 (b) 16.5 (c) 0.0165 (d) 0.165
  20. 20.0.51 × 7 — where does the decimal point go? (a) 3.57 (b) 0.0357 (c) 0.357 (d) 35.7
  21. 21.0.43 × 8 — where does the decimal point go? (a) 3.44 (b) 34.4 (c) 0.344 (d) 0.0344
  22. 22.2.2 × 2 — where does the decimal point go? (a) 0.44 (b) 4.4 (c) 0.044 (d) 44
  23. 23.0.47 × 32 — where does the decimal point go? (a) 15.04 (b) 1.504 (c) 0.1504 (d) 150.4
  24. 24.0.47 × 0.4 — where does the decimal point go? (a) 1.88 (b) 0.00188 (c) 0.188 (d) 0.0188
  25. 25.0.38 × 2.1 — where does the decimal point go? (a) 0.0798 (b) 0.00798 (c) 7.98 (d) 0.798
  26. 26.1.8 × 1.4 — where does the decimal point go? (a) 2.52 (b) 25.2 (c) 0.0252 (d) 0.252
  27. 27.4.2 × 4 — where does the decimal point go? (a) 1.68 (b) 168 (c) 0.168 (d) 16.8
  28. 28.0.32 × 3.8 — where does the decimal point go? (a) 1.216 (b) 0.01216 (c) 12.16 (d) 0.1216
  29. 29.5.4 × 3 — where does the decimal point go? (a) 0.162 (b) 162 (c) 16.2 (d) 1.62
  30. 30.0.25 × 5 — where does the decimal point go? (a) 0.0125 (b) 0.125 (c) 12.5 (d) 1.25
  31. 31.0.21 × 2.1 — where does the decimal point go? (a) 0.441 (b) 0.00441 (c) 4.41 (d) 0.0441
  32. 32.0.78 × 48 — where does the decimal point go? (a) 0.3744 (b) 374.4 (c) 3.744 (d) 37.44
  33. 33.5.2 × 4 — where does the decimal point go? (a) 20.8 (b) 2.08 (c) 208 (d) 0.208
  34. 34.0.54 × 2 — where does the decimal point go? (a) 0.0108 (b) 1.08 (c) 10.8 (d) 0.108
  35. 35.3.7 × 29 — where does the decimal point go? (a) 1.073 (b) 1073 (c) 10.73 (d) 107.3
  36. 36.8.9 × 0.4 — where does the decimal point go? (a) 35.6 (b) 3.56 (c) 0.356 (d) 0.0356
  37. 37.0.64 × 4.6 — where does the decimal point go? (a) 29.44 (b) 2.944 (c) 0.2944 (d) 0.02944
  38. 38.3.8 × 4 — where does the decimal point go? (a) 152 (b) 1.52 (c) 15.2 (d) 0.152
  39. 39.4.6 × 7 — where does the decimal point go? (a) 3.22 (b) 0.322 (c) 322 (d) 32.2
  40. 40.0.63 × 9 — where does the decimal point go? (a) 0.567 (b) 5.67 (c) 56.7 (d) 0.0567

Answer key

  1. 25.08
  2. 0.036
  3. 3.52
  4. 22.5
  5. 2.64
  6. 31.85
  7. 0.142
  8. 337.5
  9. 0.258
  10. 5.82
  11. 6.93
  12. 3.038
  13. 1.28
  14. 11.89
  15. 122.4
  16. 8.64
  17. 0.275
  18. 12.6
  19. 1.65
  20. 3.57
  21. 3.44
  22. 4.4
  23. 15.04
  24. 0.188
  25. 0.798
  26. 2.52
  27. 16.8
  28. 1.216
  29. 16.2
  30. 1.25
  31. 0.441
  32. 37.44
  33. 20.8
  34. 1.08
  35. 107.3
  36. 3.56
  37. 2.944
  38. 15.2
  39. 32.2
  40. 5.67

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