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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 729 · 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 × 1.7 — where does the decimal point go? (a) 79.9 (b) 7.99 (c) 0.799 (d) 0.0799
  2. 2.0.77 × 5 — where does the decimal point go? (a) 0.385 (b) 3.85 (c) 0.0385 (d) 38.5
  3. 3.0.33 × 41 — where does the decimal point go? (a) 0.1353 (b) 13.53 (c) 1.353 (d) 135.3
  4. 4.2.9 × 0.6 — where does the decimal point go? (a) 17.4 (b) 0.0174 (c) 0.174 (d) 1.74
  5. 5.0.66 × 9 — where does the decimal point go? (a) 59.4 (b) 0.0594 (c) 5.94 (d) 0.594
  6. 6.0.72 × 2.8 — where does the decimal point go? (a) 0.2016 (b) 20.16 (c) 2.016 (d) 0.02016
  7. 7.5.3 × 33 — where does the decimal point go? (a) 174.9 (b) 17.49 (c) 1749 (d) 1.749
  8. 8.2.6 × 0.6 — where does the decimal point go? (a) 15.6 (b) 0.156 (c) 0.0156 (d) 1.56
  9. 9.3.1 × 2 — where does the decimal point go? (a) 0.062 (b) 0.62 (c) 62 (d) 6.2
  10. 10.0.76 × 8 — where does the decimal point go? (a) 0.0608 (b) 0.608 (c) 6.08 (d) 60.8
  11. 11.4.3 × 45 — where does the decimal point go? (a) 19.35 (b) 193.5 (c) 1.935 (d) 1935
  12. 12.0.58 × 9 — where does the decimal point go? (a) 0.0522 (b) 0.522 (c) 5.22 (d) 52.2
  13. 13.6.4 × 0.7 — where does the decimal point go? (a) 4.48 (b) 0.0448 (c) 44.8 (d) 0.448
  14. 14.6.5 × 5 — where does the decimal point go? (a) 0.325 (b) 3.25 (c) 32.5 (d) 325
  15. 15.0.35 × 7 — where does the decimal point go? (a) 2.45 (b) 0.245 (c) 0.0245 (d) 24.5
  16. 16.0.32 × 0.9 — where does the decimal point go? (a) 0.0288 (b) 0.288 (c) 0.00288 (d) 2.88
  17. 17.0.35 × 0.9 — where does the decimal point go? (a) 0.0315 (b) 0.315 (c) 3.15 (d) 0.00315
  18. 18.6.6 × 0.4 — where does the decimal point go? (a) 2.64 (b) 0.0264 (c) 26.4 (d) 0.264
  19. 19.5.7 × 5 — where does the decimal point go? (a) 2.85 (b) 0.285 (c) 285 (d) 28.5
  20. 20.7.4 × 2 — where does the decimal point go? (a) 1.48 (b) 14.8 (c) 148 (d) 0.148
  21. 21.1.3 × 9 — where does the decimal point go? (a) 1.17 (b) 11.7 (c) 0.117 (d) 117
  22. 22.0.76 × 0.3 — where does the decimal point go? (a) 2.28 (b) 0.0228 (c) 0.00228 (d) 0.228
  23. 23.4.5 × 5 — where does the decimal point go? (a) 22.5 (b) 2.25 (c) 0.225 (d) 225
  24. 24.7.7 × 0.8 — where does the decimal point go? (a) 0.616 (b) 61.6 (c) 6.16 (d) 0.0616
  25. 25.8.6 × 7 — where does the decimal point go? (a) 0.602 (b) 602 (c) 60.2 (d) 6.02
  26. 26.6.4 × 38 — where does the decimal point go? (a) 243.2 (b) 24.32 (c) 2432 (d) 2.432
  27. 27.1.6 × 26 — where does the decimal point go? (a) 41.6 (b) 4.16 (c) 416 (d) 0.416
  28. 28.7.8 × 1.8 — where does the decimal point go? (a) 0.1404 (b) 140.4 (c) 14.04 (d) 1.404
  29. 29.0.21 × 1.2 — where does the decimal point go? (a) 0.252 (b) 0.00252 (c) 2.52 (d) 0.0252
  30. 30.0.94 × 4.2 — where does the decimal point go? (a) 0.03948 (b) 0.3948 (c) 39.48 (d) 3.948
  31. 31.4.1 × 0.6 — where does the decimal point go? (a) 0.246 (b) 2.46 (c) 24.6 (d) 0.0246
  32. 32.0.82 × 0.8 — where does the decimal point go? (a) 0.656 (b) 0.0656 (c) 6.56 (d) 0.00656
  33. 33.0.12 × 0.6 — where does the decimal point go? (a) 0.0072 (b) 0.00072 (c) 0.072 (d) 0.72
  34. 34.5.2 × 2.2 — where does the decimal point go? (a) 114.4 (b) 11.44 (c) 0.1144 (d) 1.144
  35. 35.0.36 × 0.6 — where does the decimal point go? (a) 0.216 (b) 0.00216 (c) 0.0216 (d) 2.16
  36. 36.0.91 × 43 — where does the decimal point go? (a) 0.3913 (b) 39.13 (c) 3.913 (d) 391.3
  37. 37.0.93 × 3.1 — where does the decimal point go? (a) 0.02883 (b) 28.83 (c) 0.2883 (d) 2.883
  38. 38.5.6 × 33 — where does the decimal point go? (a) 1.848 (b) 1848 (c) 18.48 (d) 184.8
  39. 39.0.21 × 21 — where does the decimal point go? (a) 44.1 (b) 4.41 (c) 0.441 (d) 0.0441
  40. 40.0.64 × 0.3 — where does the decimal point go? (a) 0.00192 (b) 0.0192 (c) 1.92 (d) 0.192

Answer key

  1. 7.99
  2. 3.85
  3. 13.53
  4. 1.74
  5. 5.94
  6. 2.016
  7. 174.9
  8. 1.56
  9. 6.2
  10. 6.08
  11. 193.5
  12. 5.22
  13. 4.48
  14. 32.5
  15. 2.45
  16. 0.288
  17. 0.315
  18. 2.64
  19. 28.5
  20. 14.8
  21. 11.7
  22. 0.228
  23. 22.5
  24. 6.16
  25. 60.2
  26. 243.2
  27. 41.6
  28. 14.04
  29. 0.252
  30. 3.948
  31. 2.46
  32. 0.656
  33. 0.072
  34. 11.44
  35. 0.216
  36. 39.13
  37. 2.883
  38. 184.8
  39. 4.41
  40. 0.192

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