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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 787 · 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. 1.5.1 × 14 — where does the decimal point go? (a) 714 (b) 0.714 (c) 71.4 (d) 7.14
  2. 2.0.91 × 0.9 — where does the decimal point go? (a) 8.19 (b) 0.00819 (c) 0.0819 (d) 0.819
  3. 3.5.9 × 9 — where does the decimal point go? (a) 5.31 (b) 53.1 (c) 531 (d) 0.531
  4. 4.1.8 × 2 — where does the decimal point go? (a) 0.36 (b) 0.036 (c) 36 (d) 3.6
  5. 5.0.12 × 4.9 — where does the decimal point go? (a) 0.00588 (b) 0.588 (c) 5.88 (d) 0.0588
  6. 6.0.46 × 42 — where does the decimal point go? (a) 193.2 (b) 1.932 (c) 0.1932 (d) 19.32
  7. 7.0.97 × 5 — where does the decimal point go? (a) 0.485 (b) 4.85 (c) 48.5 (d) 0.0485
  8. 8.9.7 × 36 — where does the decimal point go? (a) 3492 (b) 3.492 (c) 34.92 (d) 349.2
  9. 9.0.23 × 6 — where does the decimal point go? (a) 13.8 (b) 0.0138 (c) 1.38 (d) 0.138
  10. 10.0.68 × 8 — where does the decimal point go? (a) 5.44 (b) 54.4 (c) 0.544 (d) 0.0544
  11. 11.0.41 × 2 — where does the decimal point go? (a) 0.0082 (b) 0.82 (c) 8.2 (d) 0.082
  12. 12.0.68 × 4.2 — where does the decimal point go? (a) 0.02856 (b) 0.2856 (c) 28.56 (d) 2.856
  13. 13.1.6 × 41 — where does the decimal point go? (a) 0.656 (b) 6.56 (c) 656 (d) 65.6
  14. 14.6.3 × 4.2 — where does the decimal point go? (a) 2.646 (b) 264.6 (c) 26.46 (d) 0.2646
  15. 15.5.9 × 3 — where does the decimal point go? (a) 0.177 (b) 1.77 (c) 17.7 (d) 177
  16. 16.7.9 × 19 — where does the decimal point go? (a) 150.1 (b) 1.501 (c) 1501 (d) 15.01
  17. 17.2.4 × 42 — where does the decimal point go? (a) 1008 (b) 1.008 (c) 100.8 (d) 10.08
  18. 18.0.99 × 48 — where does the decimal point go? (a) 4.752 (b) 47.52 (c) 475.2 (d) 0.4752
  19. 19.9.8 × 3.6 — where does the decimal point go? (a) 0.3528 (b) 3.528 (c) 35.28 (d) 352.8
  20. 20.9.4 × 2.9 — where does the decimal point go? (a) 0.2726 (b) 27.26 (c) 2.726 (d) 272.6
  21. 21.0.15 × 0.5 — where does the decimal point go? (a) 0.0075 (b) 0.075 (c) 0.75 (d) 0.00075
  22. 22.0.24 × 4.8 — where does the decimal point go? (a) 0.01152 (b) 1.152 (c) 11.52 (d) 0.1152
  23. 23.5.6 × 3.3 — where does the decimal point go? (a) 184.8 (b) 0.1848 (c) 18.48 (d) 1.848
  24. 24.0.92 × 8 — where does the decimal point go? (a) 0.736 (b) 7.36 (c) 0.0736 (d) 73.6
  25. 25.0.34 × 9 — where does the decimal point go? (a) 3.06 (b) 0.306 (c) 30.6 (d) 0.0306
  26. 26.3.9 × 7 — where does the decimal point go? (a) 273 (b) 2.73 (c) 0.273 (d) 27.3
  27. 27.0.19 × 3 — where does the decimal point go? (a) 0.057 (b) 0.57 (c) 0.0057 (d) 5.7
  28. 28.4.7 × 21 — where does the decimal point go? (a) 0.987 (b) 98.7 (c) 987 (d) 9.87
  29. 29.0.41 × 3 — where does the decimal point go? (a) 1.23 (b) 0.0123 (c) 12.3 (d) 0.123
  30. 30.6.9 × 0.4 — where does the decimal point go? (a) 0.276 (b) 2.76 (c) 27.6 (d) 0.0276
  31. 31.0.73 × 6 — where does the decimal point go? (a) 0.438 (b) 4.38 (c) 43.8 (d) 0.0438
  32. 32.9.6 × 46 — where does the decimal point go? (a) 44.16 (b) 4.416 (c) 441.6 (d) 4416
  33. 33.0.96 × 41 — where does the decimal point go? (a) 39.36 (b) 0.3936 (c) 393.6 (d) 3.936
  34. 34.2.3 × 6 — where does the decimal point go? (a) 0.138 (b) 138 (c) 13.8 (d) 1.38
  35. 35.9.2 × 39 — where does the decimal point go? (a) 3.588 (b) 35.88 (c) 358.8 (d) 3588
  36. 36.9.9 × 14 — where does the decimal point go? (a) 1386 (b) 13.86 (c) 1.386 (d) 138.6
  37. 37.0.93 × 36 — where does the decimal point go? (a) 33.48 (b) 3.348 (c) 0.3348 (d) 334.8
  38. 38.7.4 × 3.4 — where does the decimal point go? (a) 2.516 (b) 251.6 (c) 0.2516 (d) 25.16
  39. 39.5.4 × 17 — where does the decimal point go? (a) 91.8 (b) 0.918 (c) 9.18 (d) 918
  40. 40.7.3 × 3.4 — where does the decimal point go? (a) 0.2482 (b) 2.482 (c) 248.2 (d) 24.82

Answer key

  1. 71.4
  2. 0.819
  3. 53.1
  4. 3.6
  5. 0.588
  6. 19.32
  7. 4.85
  8. 349.2
  9. 1.38
  10. 5.44
  11. 0.82
  12. 2.856
  13. 65.6
  14. 26.46
  15. 17.7
  16. 150.1
  17. 100.8
  18. 47.52
  19. 35.28
  20. 27.26
  21. 0.075
  22. 1.152
  23. 18.48
  24. 7.36
  25. 3.06
  26. 27.3
  27. 0.57
  28. 98.7
  29. 1.23
  30. 2.76
  31. 4.38
  32. 441.6
  33. 39.36
  34. 13.8
  35. 358.8
  36. 138.6
  37. 33.48
  38. 25.16
  39. 91.8
  40. 24.82

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