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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 817 · 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. 1.0.21 × 34 — where does the decimal point go? (a) 7.14 (b) 71.4 (c) 0.0714 (d) 0.714
  2. 2.7.6 × 2.8 — where does the decimal point go? (a) 2.128 (b) 212.8 (c) 21.28 (d) 0.2128
  3. 3.0.27 × 0.9 — where does the decimal point go? (a) 0.0243 (b) 2.43 (c) 0.00243 (d) 0.243
  4. 4.4.2 × 2 — where does the decimal point go? (a) 84 (b) 0.84 (c) 8.4 (d) 0.084
  5. 5.0.22 × 0.9 — where does the decimal point go? (a) 0.0198 (b) 1.98 (c) 0.00198 (d) 0.198
  6. 6.0.39 × 48 — where does the decimal point go? (a) 0.1872 (b) 187.2 (c) 18.72 (d) 1.872
  7. 7.0.13 × 24 — where does the decimal point go? (a) 3.12 (b) 0.312 (c) 0.0312 (d) 31.2
  8. 8.0.33 × 3 — where does the decimal point go? (a) 0.099 (b) 0.0099 (c) 0.99 (d) 9.9
  9. 9.0.71 × 0.9 — where does the decimal point go? (a) 0.00639 (b) 0.0639 (c) 0.639 (d) 6.39
  10. 10.0.95 × 0.7 — where does the decimal point go? (a) 0.00665 (b) 0.0665 (c) 0.665 (d) 6.65
  11. 11.0.63 × 27 — where does the decimal point go? (a) 170.1 (b) 1.701 (c) 0.1701 (d) 17.01
  12. 12.0.57 × 3.8 — where does the decimal point go? (a) 0.2166 (b) 21.66 (c) 0.02166 (d) 2.166
  13. 13.1.7 × 9 — where does the decimal point go? (a) 1.53 (b) 153 (c) 15.3 (d) 0.153
  14. 14.0.63 × 6 — where does the decimal point go? (a) 37.8 (b) 3.78 (c) 0.378 (d) 0.0378
  15. 15.0.21 × 1.3 — where does the decimal point go? (a) 0.00273 (b) 0.0273 (c) 0.273 (d) 2.73
  16. 16.6.3 × 4 — where does the decimal point go? (a) 252 (b) 25.2 (c) 0.252 (d) 2.52
  17. 17.1.6 × 22 — where does the decimal point go? (a) 0.352 (b) 3.52 (c) 352 (d) 35.2
  18. 18.2.1 × 0.3 — where does the decimal point go? (a) 0.63 (b) 0.0063 (c) 0.063 (d) 6.3
  19. 19.0.33 × 0.5 — where does the decimal point go? (a) 0.00165 (b) 0.165 (c) 0.0165 (d) 1.65
  20. 20.5.5 × 1.7 — where does the decimal point go? (a) 0.935 (b) 93.5 (c) 0.0935 (d) 9.35
  21. 21.9.7 × 1.4 — where does the decimal point go? (a) 1.358 (b) 135.8 (c) 13.58 (d) 0.1358
  22. 22.8.2 × 0.2 — where does the decimal point go? (a) 0.164 (b) 0.0164 (c) 1.64 (d) 16.4
  23. 23.0.16 × 0.9 — where does the decimal point go? (a) 0.144 (b) 0.00144 (c) 0.0144 (d) 1.44
  24. 24.0.76 × 0.2 — where does the decimal point go? (a) 1.52 (b) 0.0152 (c) 0.00152 (d) 0.152
  25. 25.2.5 × 5 — where does the decimal point go? (a) 1.25 (b) 0.125 (c) 12.5 (d) 125
  26. 26.2.9 × 2 — where does the decimal point go? (a) 0.058 (b) 58 (c) 0.58 (d) 5.8
  27. 27.0.66 × 2.6 — where does the decimal point go? (a) 1.716 (b) 0.01716 (c) 0.1716 (d) 17.16
  28. 28.6.5 × 3 — where does the decimal point go? (a) 1.95 (b) 0.195 (c) 19.5 (d) 195
  29. 29.7.1 × 3.7 — where does the decimal point go? (a) 26.27 (b) 0.2627 (c) 262.7 (d) 2.627
  30. 30.0.12 × 0.9 — where does the decimal point go? (a) 0.108 (b) 0.0108 (c) 1.08 (d) 0.00108
  31. 31.8.8 × 2 — where does the decimal point go? (a) 176 (b) 17.6 (c) 0.176 (d) 1.76
  32. 32.0.27 × 1.3 — where does the decimal point go? (a) 0.351 (b) 0.00351 (c) 0.0351 (d) 3.51
  33. 33.9.7 × 1.9 — where does the decimal point go? (a) 184.3 (b) 0.1843 (c) 1.843 (d) 18.43
  34. 34.9.7 × 0.9 — where does the decimal point go? (a) 0.0873 (b) 0.873 (c) 87.3 (d) 8.73
  35. 35.0.97 × 1.2 — where does the decimal point go? (a) 0.1164 (b) 0.01164 (c) 11.64 (d) 1.164
  36. 36.0.93 × 4 — where does the decimal point go? (a) 0.372 (b) 3.72 (c) 0.0372 (d) 37.2
  37. 37.2.8 × 7 — where does the decimal point go? (a) 196 (b) 19.6 (c) 0.196 (d) 1.96
  38. 38.0.54 × 4 — where does the decimal point go? (a) 21.6 (b) 2.16 (c) 0.0216 (d) 0.216
  39. 39.1.8 × 42 — where does the decimal point go? (a) 7.56 (b) 75.6 (c) 0.756 (d) 756
  40. 40.9.1 × 22 — where does the decimal point go? (a) 200.2 (b) 2002 (c) 2.002 (d) 20.02

Answer key

  1. 7.14
  2. 21.28
  3. 0.243
  4. 8.4
  5. 0.198
  6. 18.72
  7. 3.12
  8. 0.99
  9. 0.639
  10. 0.665
  11. 17.01
  12. 2.166
  13. 15.3
  14. 3.78
  15. 0.273
  16. 25.2
  17. 35.2
  18. 0.63
  19. 0.165
  20. 9.35
  21. 13.58
  22. 1.64
  23. 0.144
  24. 0.152
  25. 12.5
  26. 5.8
  27. 1.716
  28. 19.5
  29. 26.27
  30. 0.108
  31. 17.6
  32. 0.351
  33. 18.43
  34. 8.73
  35. 1.164
  36. 3.72
  37. 19.6
  38. 2.16
  39. 75.6
  40. 200.2

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