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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 824 · 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. 1.3.5 × 7 — where does the decimal point go? (a) 0.245 (b) 2.45 (c) 245 (d) 24.5
  2. 2.0.57 × 0.3 — where does the decimal point go? (a) 0.00171 (b) 0.171 (c) 1.71 (d) 0.0171
  3. 3.2.6 × 2 — where does the decimal point go? (a) 0.52 (b) 0.052 (c) 5.2 (d) 52
  4. 4.5.1 × 4.1 — where does the decimal point go? (a) 0.2091 (b) 20.91 (c) 209.1 (d) 2.091
  5. 5.0.68 × 2.6 — where does the decimal point go? (a) 0.1768 (b) 0.01768 (c) 1.768 (d) 17.68
  6. 6.7.1 × 42 — where does the decimal point go? (a) 2982 (b) 2.982 (c) 29.82 (d) 298.2
  7. 7.8.1 × 4 — where does the decimal point go? (a) 0.324 (b) 32.4 (c) 324 (d) 3.24
  8. 8.0.73 × 0.4 — where does the decimal point go? (a) 0.00292 (b) 0.0292 (c) 2.92 (d) 0.292
  9. 9.1.5 × 1.9 — where does the decimal point go? (a) 2.85 (b) 0.285 (c) 28.5 (d) 0.0285
  10. 10.5.5 × 1.9 — where does the decimal point go? (a) 1.045 (b) 10.45 (c) 104.5 (d) 0.1045
  11. 11.7.2 × 48 — where does the decimal point go? (a) 34.56 (b) 3.456 (c) 3456 (d) 345.6
  12. 12.8.4 × 0.4 — where does the decimal point go? (a) 0.0336 (b) 3.36 (c) 0.336 (d) 33.6
  13. 13.0.68 × 0.7 — where does the decimal point go? (a) 0.00476 (b) 0.476 (c) 4.76 (d) 0.0476
  14. 14.2.1 × 7 — where does the decimal point go? (a) 147 (b) 1.47 (c) 14.7 (d) 0.147
  15. 15.0.39 × 29 — where does the decimal point go? (a) 11.31 (b) 113.1 (c) 1.131 (d) 0.1131
  16. 16.0.87 × 6 — where does the decimal point go? (a) 0.522 (b) 52.2 (c) 0.0522 (d) 5.22
  17. 17.9.8 × 24 — where does the decimal point go? (a) 235.2 (b) 2352 (c) 23.52 (d) 2.352
  18. 18.0.19 × 1.7 — where does the decimal point go? (a) 0.323 (b) 0.00323 (c) 3.23 (d) 0.0323
  19. 19.8.6 × 6 — where does the decimal point go? (a) 51.6 (b) 0.516 (c) 5.16 (d) 516
  20. 20.1.6 × 31 — where does the decimal point go? (a) 4.96 (b) 0.496 (c) 49.6 (d) 496
  21. 21.0.23 × 0.6 — where does the decimal point go? (a) 0.138 (b) 0.00138 (c) 0.0138 (d) 1.38
  22. 22.0.38 × 16 — where does the decimal point go? (a) 60.8 (b) 6.08 (c) 0.608 (d) 0.0608
  23. 23.0.25 × 4.3 — where does the decimal point go? (a) 0.1075 (b) 0.01075 (c) 10.75 (d) 1.075
  24. 24.6.8 × 0.8 — where does the decimal point go? (a) 0.544 (b) 0.0544 (c) 5.44 (d) 54.4
  25. 25.0.16 × 2.8 — where does the decimal point go? (a) 0.00448 (b) 4.48 (c) 0.0448 (d) 0.448
  26. 26.0.34 × 0.3 — where does the decimal point go? (a) 0.102 (b) 0.00102 (c) 1.02 (d) 0.0102
  27. 27.6.5 × 9 — where does the decimal point go? (a) 585 (b) 0.585 (c) 58.5 (d) 5.85
  28. 28.0.49 × 4.8 — where does the decimal point go? (a) 0.2352 (b) 2.352 (c) 0.02352 (d) 23.52
  29. 29.0.47 × 1.7 — where does the decimal point go? (a) 0.00799 (b) 7.99 (c) 0.0799 (d) 0.799
  30. 30.3.3 × 3.6 — where does the decimal point go? (a) 1.188 (b) 118.8 (c) 11.88 (d) 0.1188
  31. 31.6.7 × 1.7 — where does the decimal point go? (a) 11.39 (b) 113.9 (c) 1.139 (d) 0.1139
  32. 32.7.3 × 11 — where does the decimal point go? (a) 8.03 (b) 80.3 (c) 803 (d) 0.803
  33. 33.0.88 × 22 — where does the decimal point go? (a) 0.1936 (b) 1.936 (c) 19.36 (d) 193.6
  34. 34.7.4 × 8 — where does the decimal point go? (a) 59.2 (b) 0.592 (c) 592 (d) 5.92
  35. 35.1.5 × 49 — where does the decimal point go? (a) 0.735 (b) 7.35 (c) 735 (d) 73.5
  36. 36.0.22 × 2 — where does the decimal point go? (a) 0.44 (b) 0.044 (c) 0.0044 (d) 4.4
  37. 37.0.69 × 3 — where does the decimal point go? (a) 2.07 (b) 0.207 (c) 20.7 (d) 0.0207
  38. 38.1.4 × 0.6 — where does the decimal point go? (a) 0.84 (b) 0.0084 (c) 0.084 (d) 8.4
  39. 39.5.3 × 3 — where does the decimal point go? (a) 1.59 (b) 15.9 (c) 159 (d) 0.159
  40. 40.0.42 × 0.4 — where does the decimal point go? (a) 0.00168 (b) 0.168 (c) 0.0168 (d) 1.68

Answer key

  1. 24.5
  2. 0.171
  3. 5.2
  4. 20.91
  5. 1.768
  6. 298.2
  7. 32.4
  8. 0.292
  9. 2.85
  10. 10.45
  11. 345.6
  12. 3.36
  13. 0.476
  14. 14.7
  15. 11.31
  16. 5.22
  17. 235.2
  18. 0.323
  19. 51.6
  20. 49.6
  21. 0.138
  22. 6.08
  23. 1.075
  24. 5.44
  25. 0.448
  26. 0.102
  27. 58.5
  28. 2.352
  29. 0.799
  30. 11.88
  31. 11.39
  32. 80.3
  33. 19.36
  34. 59.2
  35. 73.5
  36. 0.44
  37. 2.07
  38. 0.84
  39. 15.9
  40. 0.168

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