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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 780 · 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. 1.0.51 × 39 — where does the decimal point go? (a) 198.9 (b) 19.89 (c) 1.989 (d) 0.1989
  2. 2.4.9 × 0.7 — where does the decimal point go? (a) 34.3 (b) 0.0343 (c) 0.343 (d) 3.43
  3. 3.0.66 × 2 — where does the decimal point go? (a) 13.2 (b) 0.0132 (c) 0.132 (d) 1.32
  4. 4.0.12 × 7 — where does the decimal point go? (a) 8.4 (b) 0.0084 (c) 0.084 (d) 0.84
  5. 5.9.2 × 3 — where does the decimal point go? (a) 0.276 (b) 27.6 (c) 276 (d) 2.76
  6. 6.4.7 × 0.8 — where does the decimal point go? (a) 0.0376 (b) 3.76 (c) 0.376 (d) 37.6
  7. 7.1.7 × 31 — where does the decimal point go? (a) 52.7 (b) 0.527 (c) 5.27 (d) 527
  8. 8.4.3 × 5 — where does the decimal point go? (a) 0.215 (b) 21.5 (c) 2.15 (d) 215
  9. 9.0.41 × 2 — where does the decimal point go? (a) 8.2 (b) 0.82 (c) 0.0082 (d) 0.082
  10. 10.0.21 × 4.7 — where does the decimal point go? (a) 9.87 (b) 0.0987 (c) 0.00987 (d) 0.987
  11. 11.7.5 × 0.5 — where does the decimal point go? (a) 0.0375 (b) 37.5 (c) 3.75 (d) 0.375
  12. 12.0.52 × 6 — where does the decimal point go? (a) 3.12 (b) 0.0312 (c) 0.312 (d) 31.2
  13. 13.0.22 × 39 — where does the decimal point go? (a) 8.58 (b) 0.858 (c) 0.0858 (d) 85.8
  14. 14.3.3 × 21 — where does the decimal point go? (a) 6.93 (b) 69.3 (c) 0.693 (d) 693
  15. 15.0.25 × 0.3 — where does the decimal point go? (a) 0.00075 (b) 0.075 (c) 0.75 (d) 0.0075
  16. 16.4.8 × 3 — where does the decimal point go? (a) 144 (b) 14.4 (c) 1.44 (d) 0.144
  17. 17.5.9 × 6 — where does the decimal point go? (a) 354 (b) 0.354 (c) 3.54 (d) 35.4
  18. 18.0.77 × 8 — where does the decimal point go? (a) 6.16 (b) 61.6 (c) 0.616 (d) 0.0616
  19. 19.0.36 × 1.9 — where does the decimal point go? (a) 6.84 (b) 0.00684 (c) 0.0684 (d) 0.684
  20. 20.0.99 × 24 — where does the decimal point go? (a) 0.2376 (b) 237.6 (c) 2.376 (d) 23.76
  21. 21.0.56 × 3 — where does the decimal point go? (a) 0.0168 (b) 0.168 (c) 16.8 (d) 1.68
  22. 22.0.69 × 4.6 — where does the decimal point go? (a) 3.174 (b) 0.03174 (c) 31.74 (d) 0.3174
  23. 23.0.36 × 3 — where does the decimal point go? (a) 0.0108 (b) 0.108 (c) 1.08 (d) 10.8
  24. 24.1.9 × 0.7 — where does the decimal point go? (a) 1.33 (b) 0.133 (c) 13.3 (d) 0.0133
  25. 25.7.7 × 0.6 — where does the decimal point go? (a) 0.462 (b) 4.62 (c) 46.2 (d) 0.0462
  26. 26.0.55 × 35 — where does the decimal point go? (a) 0.1925 (b) 1.925 (c) 192.5 (d) 19.25
  27. 27.0.63 × 6 — where does the decimal point go? (a) 0.0378 (b) 0.378 (c) 37.8 (d) 3.78
  28. 28.0.38 × 3.7 — where does the decimal point go? (a) 14.06 (b) 1.406 (c) 0.01406 (d) 0.1406
  29. 29.3.1 × 36 — where does the decimal point go? (a) 1116 (b) 111.6 (c) 11.16 (d) 1.116
  30. 30.7.1 × 7 — where does the decimal point go? (a) 4.97 (b) 497 (c) 0.497 (d) 49.7
  31. 31.0.29 × 42 — where does the decimal point go? (a) 12.18 (b) 0.1218 (c) 121.8 (d) 1.218
  32. 32.8.2 × 43 — where does the decimal point go? (a) 352.6 (b) 3526 (c) 35.26 (d) 3.526
  33. 33.0.91 × 2.3 — where does the decimal point go? (a) 2.093 (b) 0.2093 (c) 0.02093 (d) 20.93
  34. 34.0.44 × 4 — where does the decimal point go? (a) 0.0176 (b) 0.176 (c) 17.6 (d) 1.76
  35. 35.2.2 × 0.3 — where does the decimal point go? (a) 0.066 (b) 0.0066 (c) 6.6 (d) 0.66
  36. 36.0.43 × 4.3 — where does the decimal point go? (a) 0.01849 (b) 1.849 (c) 0.1849 (d) 18.49
  37. 37.1.2 × 4.2 — where does the decimal point go? (a) 5.04 (b) 0.0504 (c) 50.4 (d) 0.504
  38. 38.0.26 × 0.8 — where does the decimal point go? (a) 2.08 (b) 0.00208 (c) 0.0208 (d) 0.208
  39. 39.0.37 × 35 — where does the decimal point go? (a) 0.1295 (b) 129.5 (c) 1.295 (d) 12.95
  40. 40.0.37 × 3 — where does the decimal point go? (a) 11.1 (b) 0.0111 (c) 1.11 (d) 0.111

Answer key

  1. 19.89
  2. 3.43
  3. 1.32
  4. 0.84
  5. 27.6
  6. 3.76
  7. 52.7
  8. 21.5
  9. 0.82
  10. 0.987
  11. 3.75
  12. 3.12
  13. 8.58
  14. 69.3
  15. 0.075
  16. 14.4
  17. 35.4
  18. 6.16
  19. 0.684
  20. 23.76
  21. 1.68
  22. 3.174
  23. 1.08
  24. 1.33
  25. 4.62
  26. 19.25
  27. 3.78
  28. 1.406
  29. 111.6
  30. 49.7
  31. 12.18
  32. 352.6
  33. 2.093
  34. 1.76
  35. 0.66
  36. 1.849
  37. 5.04
  38. 0.208
  39. 12.95
  40. 1.11

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