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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 403 · 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. 1.9.8 × 14 — where does the decimal point go? (a) 1.372 (b) 1372 (c) 137.2 (d) 13.72
  2. 2.8.4 × 2 — where does the decimal point go? (a) 1.68 (b) 16.8 (c) 0.168 (d) 168
  3. 3.3.3 × 3.6 — where does the decimal point go? (a) 118.8 (b) 0.1188 (c) 1.188 (d) 11.88
  4. 4.0.45 × 0.9 — where does the decimal point go? (a) 0.0405 (b) 0.405 (c) 4.05 (d) 0.00405
  5. 5.2.3 × 0.4 — where does the decimal point go? (a) 0.092 (b) 0.0092 (c) 0.92 (d) 9.2
  6. 6.7.2 × 1.1 — where does the decimal point go? (a) 79.2 (b) 7.92 (c) 0.0792 (d) 0.792
  7. 7.0.17 × 2 — where does the decimal point go? (a) 0.0034 (b) 0.034 (c) 0.34 (d) 3.4
  8. 8.0.43 × 3 — where does the decimal point go? (a) 0.129 (b) 1.29 (c) 12.9 (d) 0.0129
  9. 9.0.26 × 0.3 — where does the decimal point go? (a) 0.0078 (b) 0.78 (c) 0.078 (d) 0.00078
  10. 10.0.43 × 0.7 — where does the decimal point go? (a) 0.0301 (b) 3.01 (c) 0.00301 (d) 0.301
  11. 11.0.26 × 2.8 — where does the decimal point go? (a) 0.0728 (b) 0.00728 (c) 0.728 (d) 7.28
  12. 12.0.29 × 0.4 — where does the decimal point go? (a) 1.16 (b) 0.0116 (c) 0.116 (d) 0.00116
  13. 13.0.38 × 2.8 — where does the decimal point go? (a) 0.01064 (b) 1.064 (c) 10.64 (d) 0.1064
  14. 14.4.1 × 8 — where does the decimal point go? (a) 328 (b) 32.8 (c) 0.328 (d) 3.28
  15. 15.2.6 × 0.3 — where does the decimal point go? (a) 0.0078 (b) 0.078 (c) 7.8 (d) 0.78
  16. 16.9.9 × 2.4 — where does the decimal point go? (a) 237.6 (b) 2.376 (c) 23.76 (d) 0.2376
  17. 17.0.86 × 9 — where does the decimal point go? (a) 0.0774 (b) 7.74 (c) 77.4 (d) 0.774
  18. 18.0.28 × 1.1 — where does the decimal point go? (a) 3.08 (b) 0.0308 (c) 0.00308 (d) 0.308
  19. 19.1.4 × 0.3 — where does the decimal point go? (a) 4.2 (b) 0.042 (c) 0.0042 (d) 0.42
  20. 20.7.7 × 1.4 — where does the decimal point go? (a) 1.078 (b) 107.8 (c) 0.1078 (d) 10.78
  21. 21.6.7 × 0.6 — where does the decimal point go? (a) 0.402 (b) 40.2 (c) 4.02 (d) 0.0402
  22. 22.4.3 × 2.4 — where does the decimal point go? (a) 0.1032 (b) 1.032 (c) 10.32 (d) 103.2
  23. 23.0.97 × 3 — where does the decimal point go? (a) 29.1 (b) 0.291 (c) 0.0291 (d) 2.91
  24. 24.9.5 × 0.9 — where does the decimal point go? (a) 8.55 (b) 0.0855 (c) 0.855 (d) 85.5
  25. 25.0.61 × 7 — where does the decimal point go? (a) 0.427 (b) 0.0427 (c) 4.27 (d) 42.7
  26. 26.0.93 × 4.6 — where does the decimal point go? (a) 0.4278 (b) 42.78 (c) 4.278 (d) 0.04278
  27. 27.8.2 × 6 — where does the decimal point go? (a) 492 (b) 4.92 (c) 49.2 (d) 0.492
  28. 28.0.74 × 1.1 — where does the decimal point go? (a) 8.14 (b) 0.00814 (c) 0.0814 (d) 0.814
  29. 29.0.98 × 0.7 — where does the decimal point go? (a) 0.00686 (b) 0.0686 (c) 6.86 (d) 0.686
  30. 30.4.3 × 3.1 — where does the decimal point go? (a) 13.33 (b) 0.1333 (c) 133.3 (d) 1.333
  31. 31.5.6 × 14 — where does the decimal point go? (a) 784 (b) 7.84 (c) 0.784 (d) 78.4
  32. 32.1.6 × 1.1 — where does the decimal point go? (a) 0.176 (b) 17.6 (c) 0.0176 (d) 1.76
  33. 33.9.3 × 1.8 — where does the decimal point go? (a) 1.674 (b) 0.1674 (c) 167.4 (d) 16.74
  34. 34.2.2 × 13 — where does the decimal point go? (a) 2.86 (b) 28.6 (c) 0.286 (d) 286
  35. 35.0.81 × 4.8 — where does the decimal point go? (a) 3.888 (b) 0.3888 (c) 0.03888 (d) 38.88
  36. 36.5.3 × 2.5 — where does the decimal point go? (a) 132.5 (b) 0.1325 (c) 1.325 (d) 13.25
  37. 37.8.1 × 7 — where does the decimal point go? (a) 567 (b) 5.67 (c) 0.567 (d) 56.7
  38. 38.8.8 × 4.7 — where does the decimal point go? (a) 41.36 (b) 4.136 (c) 413.6 (d) 0.4136
  39. 39.4.9 × 32 — where does the decimal point go? (a) 15.68 (b) 1568 (c) 156.8 (d) 1.568
  40. 40.0.76 × 1.6 — where does the decimal point go? (a) 12.16 (b) 1.216 (c) 0.1216 (d) 0.01216

Answer key

  1. 137.2
  2. 16.8
  3. 11.88
  4. 0.405
  5. 0.92
  6. 7.92
  7. 0.34
  8. 1.29
  9. 0.078
  10. 0.301
  11. 0.728
  12. 0.116
  13. 1.064
  14. 32.8
  15. 0.78
  16. 23.76
  17. 7.74
  18. 0.308
  19. 0.42
  20. 10.78
  21. 4.02
  22. 10.32
  23. 2.91
  24. 8.55
  25. 4.27
  26. 4.278
  27. 49.2
  28. 0.814
  29. 0.686
  30. 13.33
  31. 78.4
  32. 1.76
  33. 16.74
  34. 28.6
  35. 3.888
  36. 13.25
  37. 56.7
  38. 41.36
  39. 156.8
  40. 1.216

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