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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 47 · 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. 1.1.4 × 11 — where does the decimal point go? (a) 15.4 (b) 154 (c) 0.154 (d) 1.54
  2. 2.0.98 × 0.4 — where does the decimal point go? (a) 0.0392 (b) 0.392 (c) 0.00392 (d) 3.92
  3. 3.0.56 × 39 — where does the decimal point go? (a) 0.2184 (b) 218.4 (c) 2.184 (d) 21.84
  4. 4.0.64 × 7 — where does the decimal point go? (a) 0.0448 (b) 0.448 (c) 4.48 (d) 44.8
  5. 5.5.3 × 5 — where does the decimal point go? (a) 26.5 (b) 2.65 (c) 265 (d) 0.265
  6. 6.0.12 × 8 — where does the decimal point go? (a) 0.0096 (b) 0.096 (c) 9.6 (d) 0.96
  7. 7.0.55 × 4.1 — where does the decimal point go? (a) 0.2255 (b) 2.255 (c) 0.02255 (d) 22.55
  8. 8.3.3 × 42 — where does the decimal point go? (a) 13.86 (b) 1386 (c) 138.6 (d) 1.386
  9. 9.2.1 × 2 — where does the decimal point go? (a) 42 (b) 0.42 (c) 0.042 (d) 4.2
  10. 10.0.54 × 1.4 — where does the decimal point go? (a) 0.756 (b) 7.56 (c) 0.0756 (d) 0.00756
  11. 11.2.5 × 5 — where does the decimal point go? (a) 1.25 (b) 125 (c) 12.5 (d) 0.125
  12. 12.3.1 × 22 — where does the decimal point go? (a) 682 (b) 6.82 (c) 68.2 (d) 0.682
  13. 13.0.63 × 42 — where does the decimal point go? (a) 26.46 (b) 0.2646 (c) 264.6 (d) 2.646
  14. 14.1.6 × 0.7 — where does the decimal point go? (a) 0.0112 (b) 1.12 (c) 11.2 (d) 0.112
  15. 15.5.9 × 0.9 — where does the decimal point go? (a) 5.31 (b) 0.531 (c) 0.0531 (d) 53.1
  16. 16.3.3 × 0.3 — where does the decimal point go? (a) 0.099 (b) 0.0099 (c) 0.99 (d) 9.9
  17. 17.0.36 × 18 — where does the decimal point go? (a) 0.648 (b) 0.0648 (c) 64.8 (d) 6.48
  18. 18.0.89 × 7 — where does the decimal point go? (a) 6.23 (b) 0.0623 (c) 0.623 (d) 62.3
  19. 19.6.1 × 7 — where does the decimal point go? (a) 427 (b) 4.27 (c) 0.427 (d) 42.7
  20. 20.0.21 × 3.1 — where does the decimal point go? (a) 0.00651 (b) 0.651 (c) 6.51 (d) 0.0651
  21. 21.0.18 × 2 — where does the decimal point go? (a) 0.36 (b) 0.036 (c) 0.0036 (d) 3.6
  22. 22.0.67 × 28 — where does the decimal point go? (a) 187.6 (b) 1.876 (c) 18.76 (d) 0.1876
  23. 23.2.1 × 8 — where does the decimal point go? (a) 16.8 (b) 0.168 (c) 1.68 (d) 168
  24. 24.7.9 × 0.3 — where does the decimal point go? (a) 2.37 (b) 0.237 (c) 0.0237 (d) 23.7
  25. 25.3.4 × 9 — where does the decimal point go? (a) 3.06 (b) 30.6 (c) 0.306 (d) 306
  26. 26.6.3 × 0.5 — where does the decimal point go? (a) 0.0315 (b) 31.5 (c) 3.15 (d) 0.315
  27. 27.6.8 × 14 — where does the decimal point go? (a) 0.952 (b) 952 (c) 95.2 (d) 9.52
  28. 28.0.87 × 0.2 — where does the decimal point go? (a) 0.174 (b) 0.00174 (c) 1.74 (d) 0.0174
  29. 29.0.36 × 0.4 — where does the decimal point go? (a) 0.144 (b) 0.0144 (c) 0.00144 (d) 1.44
  30. 30.8.2 × 0.8 — where does the decimal point go? (a) 0.0656 (b) 6.56 (c) 0.656 (d) 65.6
  31. 31.0.19 × 1.1 — where does the decimal point go? (a) 0.00209 (b) 0.209 (c) 0.0209 (d) 2.09
  32. 32.1.3 × 8 — where does the decimal point go? (a) 0.104 (b) 1.04 (c) 10.4 (d) 104
  33. 33.0.22 × 0.2 — where does the decimal point go? (a) 0.0044 (b) 0.00044 (c) 0.044 (d) 0.44
  34. 34.1.8 × 2.2 — where does the decimal point go? (a) 39.6 (b) 3.96 (c) 0.396 (d) 0.0396
  35. 35.0.12 × 0.2 — where does the decimal point go? (a) 0.024 (b) 0.00024 (c) 0.0024 (d) 0.24
  36. 36.5.9 × 39 — where does the decimal point go? (a) 2.301 (b) 2301 (c) 230.1 (d) 23.01
  37. 37.0.67 × 0.2 — where does the decimal point go? (a) 0.00134 (b) 0.0134 (c) 1.34 (d) 0.134
  38. 38.0.28 × 49 — where does the decimal point go? (a) 137.2 (b) 1.372 (c) 0.1372 (d) 13.72
  39. 39.9.3 × 0.3 — where does the decimal point go? (a) 2.79 (b) 0.279 (c) 27.9 (d) 0.0279
  40. 40.0.32 × 1.4 — where does the decimal point go? (a) 0.00448 (b) 4.48 (c) 0.448 (d) 0.0448

Answer key

  1. 15.4
  2. 0.392
  3. 21.84
  4. 4.48
  5. 26.5
  6. 0.96
  7. 2.255
  8. 138.6
  9. 4.2
  10. 0.756
  11. 12.5
  12. 68.2
  13. 26.46
  14. 1.12
  15. 5.31
  16. 0.99
  17. 6.48
  18. 6.23
  19. 42.7
  20. 0.651
  21. 0.36
  22. 18.76
  23. 16.8
  24. 2.37
  25. 30.6
  26. 3.15
  27. 95.2
  28. 0.174
  29. 0.144
  30. 6.56
  31. 0.209
  32. 10.4
  33. 0.044
  34. 3.96
  35. 0.024
  36. 230.1
  37. 0.134
  38. 13.72
  39. 2.79
  40. 0.448

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