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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 406 · 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. 1.9.9 × 4.2 — where does the decimal point go? (a) 41.58 (b) 0.4158 (c) 4.158 (d) 415.8
  2. 2.4.7 × 14 — where does the decimal point go? (a) 658 (b) 6.58 (c) 0.658 (d) 65.8
  3. 3.0.16 × 0.6 — where does the decimal point go? (a) 0.096 (b) 0.00096 (c) 0.0096 (d) 0.96
  4. 4.0.91 × 0.2 — where does the decimal point go? (a) 1.82 (b) 0.0182 (c) 0.00182 (d) 0.182
  5. 5.3.5 × 35 — where does the decimal point go? (a) 1225 (b) 1.225 (c) 12.25 (d) 122.5
  6. 6.4.4 × 0.2 — where does the decimal point go? (a) 0.0088 (b) 0.088 (c) 0.88 (d) 8.8
  7. 7.3.5 × 0.7 — where does the decimal point go? (a) 0.0245 (b) 24.5 (c) 0.245 (d) 2.45
  8. 8.0.27 × 7 — where does the decimal point go? (a) 18.9 (b) 0.189 (c) 0.0189 (d) 1.89
  9. 9.0.37 × 2.6 — where does the decimal point go? (a) 0.0962 (b) 0.962 (c) 9.62 (d) 0.00962
  10. 10.7.4 × 3.8 — where does the decimal point go? (a) 281.2 (b) 0.2812 (c) 2.812 (d) 28.12
  11. 11.0.76 × 42 — where does the decimal point go? (a) 319.2 (b) 31.92 (c) 3.192 (d) 0.3192
  12. 12.8.9 × 8 — where does the decimal point go? (a) 712 (b) 0.712 (c) 71.2 (d) 7.12
  13. 13.0.96 × 0.7 — where does the decimal point go? (a) 0.00672 (b) 0.672 (c) 6.72 (d) 0.0672
  14. 14.0.22 × 9 — where does the decimal point go? (a) 1.98 (b) 0.0198 (c) 19.8 (d) 0.198
  15. 15.6.5 × 1.1 — where does the decimal point go? (a) 71.5 (b) 0.715 (c) 0.0715 (d) 7.15
  16. 16.0.91 × 3.9 — where does the decimal point go? (a) 0.03549 (b) 3.549 (c) 35.49 (d) 0.3549
  17. 17.0.63 × 3 — where does the decimal point go? (a) 0.0189 (b) 1.89 (c) 0.189 (d) 18.9
  18. 18.2.2 × 0.2 — where does the decimal point go? (a) 0.44 (b) 0.0044 (c) 4.4 (d) 0.044
  19. 19.7.9 × 0.2 — where does the decimal point go? (a) 15.8 (b) 1.58 (c) 0.158 (d) 0.0158
  20. 20.1.2 × 8 — where does the decimal point go? (a) 9.6 (b) 0.096 (c) 96 (d) 0.96
  21. 21.0.57 × 2 — where does the decimal point go? (a) 0.114 (b) 1.14 (c) 0.0114 (d) 11.4
  22. 22.9.1 × 13 — where does the decimal point go? (a) 1.183 (b) 1183 (c) 118.3 (d) 11.83
  23. 23.0.96 × 7 — where does the decimal point go? (a) 0.672 (b) 0.0672 (c) 67.2 (d) 6.72
  24. 24.1.6 × 4 — where does the decimal point go? (a) 0.64 (b) 6.4 (c) 64 (d) 0.064
  25. 25.0.38 × 2.8 — where does the decimal point go? (a) 0.1064 (b) 10.64 (c) 0.01064 (d) 1.064
  26. 26.9.1 × 0.8 — where does the decimal point go? (a) 0.728 (b) 72.8 (c) 7.28 (d) 0.0728
  27. 27.9.4 × 27 — where does the decimal point go? (a) 2538 (b) 253.8 (c) 2.538 (d) 25.38
  28. 28.0.91 × 1.6 — where does the decimal point go? (a) 0.01456 (b) 0.1456 (c) 14.56 (d) 1.456
  29. 29.3.3 × 9 — where does the decimal point go? (a) 2.97 (b) 0.297 (c) 297 (d) 29.7
  30. 30.0.29 × 0.9 — where does the decimal point go? (a) 0.00261 (b) 0.0261 (c) 2.61 (d) 0.261
  31. 31.4.2 × 37 — where does the decimal point go? (a) 155.4 (b) 1.554 (c) 15.54 (d) 1554
  32. 32.3.4 × 0.8 — where does the decimal point go? (a) 0.0272 (b) 0.272 (c) 27.2 (d) 2.72
  33. 33.7.2 × 3 — where does the decimal point go? (a) 0.216 (b) 21.6 (c) 2.16 (d) 216
  34. 34.9.8 × 9 — where does the decimal point go? (a) 8.82 (b) 88.2 (c) 882 (d) 0.882
  35. 35.7.8 × 1.9 — where does the decimal point go? (a) 0.1482 (b) 148.2 (c) 14.82 (d) 1.482
  36. 36.9.8 × 3.7 — where does the decimal point go? (a) 3.626 (b) 362.6 (c) 36.26 (d) 0.3626
  37. 37.3.4 × 1.9 — where does the decimal point go? (a) 0.646 (b) 6.46 (c) 64.6 (d) 0.0646
  38. 38.0.64 × 4.7 — where does the decimal point go? (a) 30.08 (b) 3.008 (c) 0.03008 (d) 0.3008
  39. 39.5.9 × 3 — where does the decimal point go? (a) 0.177 (b) 177 (c) 17.7 (d) 1.77
  40. 40.3.3 × 17 — where does the decimal point go? (a) 561 (b) 56.1 (c) 0.561 (d) 5.61

Answer key

  1. 41.58
  2. 65.8
  3. 0.096
  4. 0.182
  5. 122.5
  6. 0.88
  7. 2.45
  8. 1.89
  9. 0.962
  10. 28.12
  11. 31.92
  12. 71.2
  13. 0.672
  14. 1.98
  15. 7.15
  16. 3.549
  17. 1.89
  18. 0.44
  19. 1.58
  20. 9.6
  21. 1.14
  22. 118.3
  23. 6.72
  24. 6.4
  25. 1.064
  26. 7.28
  27. 253.8
  28. 1.456
  29. 29.7
  30. 0.261
  31. 155.4
  32. 2.72
  33. 21.6
  34. 88.2
  35. 14.82
  36. 36.26
  37. 6.46
  38. 3.008
  39. 17.7
  40. 56.1

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