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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 947 · 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. 1.9.7 × 7 — where does the decimal point go? (a) 67.9 (b) 679 (c) 0.679 (d) 6.79
  2. 2.3.6 × 4.1 — where does the decimal point go? (a) 147.6 (b) 1.476 (c) 0.1476 (d) 14.76
  3. 3.0.83 × 0.8 — where does the decimal point go? (a) 0.664 (b) 0.00664 (c) 0.0664 (d) 6.64
  4. 4.0.41 × 0.6 — where does the decimal point go? (a) 0.00246 (b) 0.246 (c) 2.46 (d) 0.0246
  5. 5.1.5 × 4.5 — where does the decimal point go? (a) 6.75 (b) 0.0675 (c) 0.675 (d) 67.5
  6. 6.0.71 × 8 — where does the decimal point go? (a) 5.68 (b) 0.568 (c) 56.8 (d) 0.0568
  7. 7.0.34 × 33 — where does the decimal point go? (a) 0.1122 (b) 112.2 (c) 1.122 (d) 11.22
  8. 8.2.4 × 0.9 — where does the decimal point go? (a) 21.6 (b) 0.0216 (c) 0.216 (d) 2.16
  9. 9.2.9 × 0.6 — where does the decimal point go? (a) 1.74 (b) 0.174 (c) 0.0174 (d) 17.4
  10. 10.8.8 × 6 — where does the decimal point go? (a) 0.528 (b) 52.8 (c) 528 (d) 5.28
  11. 11.0.82 × 0.6 — where does the decimal point go? (a) 4.92 (b) 0.0492 (c) 0.492 (d) 0.00492
  12. 12.5.7 × 38 — where does the decimal point go? (a) 216.6 (b) 2166 (c) 21.66 (d) 2.166
  13. 13.0.74 × 8 — where does the decimal point go? (a) 0.0592 (b) 59.2 (c) 0.592 (d) 5.92
  14. 14.3.8 × 0.7 — where does the decimal point go? (a) 0.0266 (b) 26.6 (c) 2.66 (d) 0.266
  15. 15.8.5 × 25 — where does the decimal point go? (a) 2.125 (b) 21.25 (c) 2125 (d) 212.5
  16. 16.3.9 × 0.7 — where does the decimal point go? (a) 2.73 (b) 27.3 (c) 0.0273 (d) 0.273
  17. 17.5.7 × 1.5 — where does the decimal point go? (a) 8.55 (b) 0.0855 (c) 85.5 (d) 0.855
  18. 18.9.3 × 22 — where does the decimal point go? (a) 204.6 (b) 20.46 (c) 2046 (d) 2.046
  19. 19.9.8 × 7 — where does the decimal point go? (a) 6.86 (b) 686 (c) 68.6 (d) 0.686
  20. 20.6.4 × 6 — where does the decimal point go? (a) 38.4 (b) 3.84 (c) 0.384 (d) 384
  21. 21.3.4 × 0.7 — where does the decimal point go? (a) 0.238 (b) 0.0238 (c) 23.8 (d) 2.38
  22. 22.0.72 × 0.6 — where does the decimal point go? (a) 4.32 (b) 0.0432 (c) 0.432 (d) 0.00432
  23. 23.9.1 × 0.8 — where does the decimal point go? (a) 0.728 (b) 7.28 (c) 72.8 (d) 0.0728
  24. 24.3.1 × 2 — where does the decimal point go? (a) 62 (b) 0.062 (c) 6.2 (d) 0.62
  25. 25.3.7 × 16 — where does the decimal point go? (a) 0.592 (b) 59.2 (c) 5.92 (d) 592
  26. 26.0.77 × 1.5 — where does the decimal point go? (a) 1.155 (b) 0.1155 (c) 11.55 (d) 0.01155
  27. 27.0.68 × 19 — where does the decimal point go? (a) 12.92 (b) 1.292 (c) 0.1292 (d) 129.2
  28. 28.5.6 × 3 — where does the decimal point go? (a) 0.168 (b) 168 (c) 1.68 (d) 16.8
  29. 29.3.4 × 1.4 — where does the decimal point go? (a) 0.476 (b) 0.0476 (c) 4.76 (d) 47.6
  30. 30.9.7 × 3 — where does the decimal point go? (a) 291 (b) 0.291 (c) 2.91 (d) 29.1
  31. 31.0.85 × 4.9 — where does the decimal point go? (a) 4.165 (b) 0.4165 (c) 41.65 (d) 0.04165
  32. 32.5.7 × 0.8 — where does the decimal point go? (a) 45.6 (b) 4.56 (c) 0.456 (d) 0.0456
  33. 33.0.32 × 0.4 — where does the decimal point go? (a) 0.00128 (b) 0.128 (c) 1.28 (d) 0.0128
  34. 34.3.3 × 3.7 — where does the decimal point go? (a) 0.1221 (b) 1.221 (c) 122.1 (d) 12.21
  35. 35.0.15 × 7 — where does the decimal point go? (a) 0.0105 (b) 0.105 (c) 10.5 (d) 1.05
  36. 36.8.6 × 1.8 — where does the decimal point go? (a) 0.1548 (b) 15.48 (c) 1.548 (d) 154.8
  37. 37.0.86 × 0.2 — where does the decimal point go? (a) 1.72 (b) 0.0172 (c) 0.00172 (d) 0.172
  38. 38.0.29 × 9 — where does the decimal point go? (a) 0.0261 (b) 0.261 (c) 26.1 (d) 2.61
  39. 39.6.5 × 0.5 — where does the decimal point go? (a) 0.0325 (b) 32.5 (c) 3.25 (d) 0.325
  40. 40.0.52 × 0.2 — where does the decimal point go? (a) 0.00104 (b) 1.04 (c) 0.104 (d) 0.0104

Answer key

  1. 67.9
  2. 14.76
  3. 0.664
  4. 0.246
  5. 6.75
  6. 5.68
  7. 11.22
  8. 2.16
  9. 1.74
  10. 52.8
  11. 0.492
  12. 216.6
  13. 5.92
  14. 2.66
  15. 212.5
  16. 2.73
  17. 8.55
  18. 204.6
  19. 68.6
  20. 38.4
  21. 2.38
  22. 0.432
  23. 7.28
  24. 6.2
  25. 59.2
  26. 1.155
  27. 12.92
  28. 16.8
  29. 4.76
  30. 29.1
  31. 4.165
  32. 4.56
  33. 0.128
  34. 12.21
  35. 1.05
  36. 15.48
  37. 0.172
  38. 2.61
  39. 3.25
  40. 0.104

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