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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 451 · 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. 1.4.7 × 2.9 — where does the decimal point go? (a) 13.63 (b) 1.363 (c) 136.3 (d) 0.1363
  2. 2.5.7 × 0.3 — where does the decimal point go? (a) 0.171 (b) 0.0171 (c) 1.71 (d) 17.1
  3. 3.0.74 × 0.7 — where does the decimal point go? (a) 0.00518 (b) 5.18 (c) 0.0518 (d) 0.518
  4. 4.0.73 × 0.3 — where does the decimal point go? (a) 0.0219 (b) 0.00219 (c) 0.219 (d) 2.19
  5. 5.0.17 × 0.7 — where does the decimal point go? (a) 1.19 (b) 0.00119 (c) 0.119 (d) 0.0119
  6. 6.0.65 × 13 — where does the decimal point go? (a) 8.45 (b) 84.5 (c) 0.845 (d) 0.0845
  7. 7.1.6 × 16 — where does the decimal point go? (a) 2.56 (b) 0.256 (c) 256 (d) 25.6
  8. 8.5.6 × 0.7 — where does the decimal point go? (a) 0.0392 (b) 0.392 (c) 39.2 (d) 3.92
  9. 9.8.6 × 0.7 — where does the decimal point go? (a) 6.02 (b) 0.602 (c) 0.0602 (d) 60.2
  10. 10.0.86 × 33 — where does the decimal point go? (a) 2.838 (b) 283.8 (c) 0.2838 (d) 28.38
  11. 11.0.66 × 17 — where does the decimal point go? (a) 11.22 (b) 0.1122 (c) 112.2 (d) 1.122
  12. 12.0.41 × 34 — where does the decimal point go? (a) 1.394 (b) 0.1394 (c) 13.94 (d) 139.4
  13. 13.6.5 × 0.3 — where does the decimal point go? (a) 1.95 (b) 0.195 (c) 0.0195 (d) 19.5
  14. 14.9.1 × 5 — where does the decimal point go? (a) 0.455 (b) 45.5 (c) 455 (d) 4.55
  15. 15.7.1 × 9 — where does the decimal point go? (a) 639 (b) 0.639 (c) 63.9 (d) 6.39
  16. 16.0.99 × 5 — where does the decimal point go? (a) 0.0495 (b) 49.5 (c) 0.495 (d) 4.95
  17. 17.1.3 × 0.8 — where does the decimal point go? (a) 10.4 (b) 1.04 (c) 0.104 (d) 0.0104
  18. 18.5.2 × 3 — where does the decimal point go? (a) 156 (b) 1.56 (c) 0.156 (d) 15.6
  19. 19.0.36 × 21 — where does the decimal point go? (a) 75.6 (b) 0.756 (c) 7.56 (d) 0.0756
  20. 20.0.83 × 18 — where does the decimal point go? (a) 149.4 (b) 0.1494 (c) 14.94 (d) 1.494
  21. 21.6.3 × 16 — where does the decimal point go? (a) 1.008 (b) 1008 (c) 100.8 (d) 10.08
  22. 22.1.9 × 5 — where does the decimal point go? (a) 0.95 (b) 9.5 (c) 0.095 (d) 95
  23. 23.0.44 × 0.6 — where does the decimal point go? (a) 0.264 (b) 0.0264 (c) 0.00264 (d) 2.64
  24. 24.3.3 × 29 — where does the decimal point go? (a) 9.57 (b) 95.7 (c) 957 (d) 0.957
  25. 25.1.6 × 1.7 — where does the decimal point go? (a) 0.0272 (b) 0.272 (c) 27.2 (d) 2.72
  26. 26.8.2 × 8 — where does the decimal point go? (a) 656 (b) 65.6 (c) 6.56 (d) 0.656
  27. 27.0.27 × 46 — where does the decimal point go? (a) 0.1242 (b) 1.242 (c) 124.2 (d) 12.42
  28. 28.0.29 × 3.2 — where does the decimal point go? (a) 0.928 (b) 0.00928 (c) 0.0928 (d) 9.28
  29. 29.0.92 × 49 — where does the decimal point go? (a) 450.8 (b) 45.08 (c) 0.4508 (d) 4.508
  30. 30.4.2 × 0.2 — where does the decimal point go? (a) 8.4 (b) 0.84 (c) 0.084 (d) 0.0084
  31. 31.6.7 × 6 — where does the decimal point go? (a) 40.2 (b) 402 (c) 0.402 (d) 4.02
  32. 32.6.6 × 2 — where does the decimal point go? (a) 0.132 (b) 13.2 (c) 1.32 (d) 132
  33. 33.0.42 × 31 — where does the decimal point go? (a) 0.1302 (b) 130.2 (c) 1.302 (d) 13.02
  34. 34.1.7 × 0.9 — where does the decimal point go? (a) 0.153 (b) 0.0153 (c) 1.53 (d) 15.3
  35. 35.1.9 × 36 — where does the decimal point go? (a) 6.84 (b) 0.684 (c) 684 (d) 68.4
  36. 36.5.1 × 6 — where does the decimal point go? (a) 30.6 (b) 3.06 (c) 306 (d) 0.306
  37. 37.0.52 × 0.9 — where does the decimal point go? (a) 0.468 (b) 0.00468 (c) 4.68 (d) 0.0468
  38. 38.9.5 × 7 — where does the decimal point go? (a) 0.665 (b) 66.5 (c) 665 (d) 6.65
  39. 39.0.54 × 0.7 — where does the decimal point go? (a) 0.0378 (b) 0.00378 (c) 0.378 (d) 3.78
  40. 40.4.1 × 5 — where does the decimal point go? (a) 0.205 (b) 20.5 (c) 2.05 (d) 205

Answer key

  1. 13.63
  2. 1.71
  3. 0.518
  4. 0.219
  5. 0.119
  6. 8.45
  7. 25.6
  8. 3.92
  9. 6.02
  10. 28.38
  11. 11.22
  12. 13.94
  13. 1.95
  14. 45.5
  15. 63.9
  16. 4.95
  17. 1.04
  18. 15.6
  19. 7.56
  20. 14.94
  21. 100.8
  22. 9.5
  23. 0.264
  24. 95.7
  25. 2.72
  26. 65.6
  27. 12.42
  28. 0.928
  29. 45.08
  30. 0.84
  31. 40.2
  32. 13.2
  33. 13.02
  34. 1.53
  35. 68.4
  36. 30.6
  37. 0.468
  38. 66.5
  39. 0.378
  40. 20.5

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