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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 282 · 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. 1.2.9 × 22 — where does the decimal point go? (a) 63.8 (b) 6.38 (c) 0.638 (d) 638
  2. 2.7.8 × 0.3 — where does the decimal point go? (a) 2.34 (b) 0.234 (c) 0.0234 (d) 23.4
  3. 3.9.3 × 33 — where does the decimal point go? (a) 3.069 (b) 30.69 (c) 306.9 (d) 3069
  4. 4.0.37 × 2.5 — where does the decimal point go? (a) 0.00925 (b) 9.25 (c) 0.925 (d) 0.0925
  5. 5.7.8 × 29 — where does the decimal point go? (a) 22.62 (b) 2.262 (c) 226.2 (d) 2262
  6. 6.0.86 × 2.4 — where does the decimal point go? (a) 0.2064 (b) 0.02064 (c) 2.064 (d) 20.64
  7. 7.0.78 × 3.1 — where does the decimal point go? (a) 0.02418 (b) 24.18 (c) 2.418 (d) 0.2418
  8. 8.2.9 × 6 — where does the decimal point go? (a) 17.4 (b) 174 (c) 0.174 (d) 1.74
  9. 9.0.98 × 2.1 — where does the decimal point go? (a) 0.02058 (b) 0.2058 (c) 20.58 (d) 2.058
  10. 10.0.77 × 0.6 — where does the decimal point go? (a) 0.462 (b) 0.00462 (c) 4.62 (d) 0.0462
  11. 11.7.6 × 1.7 — where does the decimal point go? (a) 1.292 (b) 129.2 (c) 0.1292 (d) 12.92
  12. 12.0.95 × 37 — where does the decimal point go? (a) 35.15 (b) 0.3515 (c) 3.515 (d) 351.5
  13. 13.7.1 × 3 — where does the decimal point go? (a) 21.3 (b) 2.13 (c) 213 (d) 0.213
  14. 14.0.17 × 0.5 — where does the decimal point go? (a) 0.0085 (b) 0.085 (c) 0.00085 (d) 0.85
  15. 15.0.84 × 3.3 — where does the decimal point go? (a) 0.02772 (b) 2.772 (c) 27.72 (d) 0.2772
  16. 16.0.33 × 0.2 — where does the decimal point go? (a) 0.66 (b) 0.0066 (c) 0.066 (d) 0.00066
  17. 17.8.8 × 38 — where does the decimal point go? (a) 334.4 (b) 33.44 (c) 3.344 (d) 3344
  18. 18.1.3 × 0.2 — where does the decimal point go? (a) 2.6 (b) 0.0026 (c) 0.026 (d) 0.26
  19. 19.6.1 × 5 — where does the decimal point go? (a) 305 (b) 30.5 (c) 0.305 (d) 3.05
  20. 20.7.7 × 0.2 — where does the decimal point go? (a) 15.4 (b) 0.0154 (c) 0.154 (d) 1.54
  21. 21.6.1 × 2.9 — where does the decimal point go? (a) 0.1769 (b) 1.769 (c) 176.9 (d) 17.69
  22. 22.0.22 × 22 — where does the decimal point go? (a) 0.0484 (b) 48.4 (c) 0.484 (d) 4.84
  23. 23.0.95 × 9 — where does the decimal point go? (a) 85.5 (b) 0.0855 (c) 8.55 (d) 0.855
  24. 24.0.83 × 36 — where does the decimal point go? (a) 29.88 (b) 0.2988 (c) 2.988 (d) 298.8
  25. 25.0.75 × 3 — where does the decimal point go? (a) 22.5 (b) 0.225 (c) 2.25 (d) 0.0225
  26. 26.0.72 × 4.3 — where does the decimal point go? (a) 30.96 (b) 0.3096 (c) 0.03096 (d) 3.096
  27. 27.0.27 × 2.2 — where does the decimal point go? (a) 0.0594 (b) 0.594 (c) 0.00594 (d) 5.94
  28. 28.1.7 × 3 — where does the decimal point go? (a) 5.1 (b) 0.51 (c) 0.051 (d) 51
  29. 29.0.81 × 8 — where does the decimal point go? (a) 6.48 (b) 0.0648 (c) 64.8 (d) 0.648
  30. 30.1.4 × 8 — where does the decimal point go? (a) 112 (b) 11.2 (c) 0.112 (d) 1.12
  31. 31.6.9 × 0.4 — where does the decimal point go? (a) 2.76 (b) 0.276 (c) 27.6 (d) 0.0276
  32. 32.0.56 × 0.4 — where does the decimal point go? (a) 0.00224 (b) 0.0224 (c) 2.24 (d) 0.224
  33. 33.0.62 × 3 — where does the decimal point go? (a) 0.186 (b) 0.0186 (c) 1.86 (d) 18.6
  34. 34.4.4 × 0.9 — where does the decimal point go? (a) 39.6 (b) 0.396 (c) 0.0396 (d) 3.96
  35. 35.0.47 × 0.2 — where does the decimal point go? (a) 0.00094 (b) 0.0094 (c) 0.94 (d) 0.094
  36. 36.0.81 × 0.7 — where does the decimal point go? (a) 5.67 (b) 0.567 (c) 0.0567 (d) 0.00567
  37. 37.0.83 × 0.9 — where does the decimal point go? (a) 7.47 (b) 0.00747 (c) 0.747 (d) 0.0747
  38. 38.0.97 × 19 — where does the decimal point go? (a) 184.3 (b) 0.1843 (c) 1.843 (d) 18.43
  39. 39.6.1 × 13 — where does the decimal point go? (a) 79.3 (b) 7.93 (c) 793 (d) 0.793
  40. 40.1.9 × 19 — where does the decimal point go? (a) 36.1 (b) 3.61 (c) 361 (d) 0.361

Answer key

  1. 63.8
  2. 2.34
  3. 306.9
  4. 0.925
  5. 226.2
  6. 2.064
  7. 2.418
  8. 17.4
  9. 2.058
  10. 0.462
  11. 12.92
  12. 35.15
  13. 21.3
  14. 0.085
  15. 2.772
  16. 0.066
  17. 334.4
  18. 0.26
  19. 30.5
  20. 1.54
  21. 17.69
  22. 4.84
  23. 8.55
  24. 29.88
  25. 2.25
  26. 3.096
  27. 0.594
  28. 5.1
  29. 6.48
  30. 11.2
  31. 2.76
  32. 0.224
  33. 1.86
  34. 3.96
  35. 0.094
  36. 0.567
  37. 0.747
  38. 18.43
  39. 79.3
  40. 36.1

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