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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 509 · 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. 1.0.87 × 16 — where does the decimal point go? (a) 0.1392 (b) 1.392 (c) 13.92 (d) 139.2
  2. 2.9.9 × 0.8 — where does the decimal point go? (a) 7.92 (b) 0.0792 (c) 0.792 (d) 79.2
  3. 3.0.88 × 34 — where does the decimal point go? (a) 2.992 (b) 299.2 (c) 0.2992 (d) 29.92
  4. 4.0.46 × 8 — where does the decimal point go? (a) 0.368 (b) 3.68 (c) 36.8 (d) 0.0368
  5. 5.0.21 × 4.7 — where does the decimal point go? (a) 9.87 (b) 0.00987 (c) 0.987 (d) 0.0987
  6. 6.4.5 × 5 — where does the decimal point go? (a) 225 (b) 22.5 (c) 2.25 (d) 0.225
  7. 7.8.1 × 2 — where does the decimal point go? (a) 1.62 (b) 16.2 (c) 0.162 (d) 162
  8. 8.0.84 × 2.7 — where does the decimal point go? (a) 0.2268 (b) 22.68 (c) 0.02268 (d) 2.268
  9. 9.4.5 × 35 — where does the decimal point go? (a) 1.575 (b) 1575 (c) 157.5 (d) 15.75
  10. 10.0.28 × 0.7 — where does the decimal point go? (a) 0.0196 (b) 0.00196 (c) 0.196 (d) 1.96
  11. 11.0.29 × 0.7 — where does the decimal point go? (a) 0.00203 (b) 0.0203 (c) 0.203 (d) 2.03
  12. 12.5.3 × 8 — where does the decimal point go? (a) 42.4 (b) 424 (c) 0.424 (d) 4.24
  13. 13.0.38 × 4.3 — where does the decimal point go? (a) 0.1634 (b) 1.634 (c) 0.01634 (d) 16.34
  14. 14.5.1 × 2.8 — where does the decimal point go? (a) 0.1428 (b) 142.8 (c) 14.28 (d) 1.428
  15. 15.0.96 × 0.8 — where does the decimal point go? (a) 0.00768 (b) 0.768 (c) 7.68 (d) 0.0768
  16. 16.0.38 × 7 — where does the decimal point go? (a) 2.66 (b) 0.266 (c) 26.6 (d) 0.0266
  17. 17.3.7 × 29 — where does the decimal point go? (a) 107.3 (b) 1073 (c) 10.73 (d) 1.073
  18. 18.0.99 × 2.9 — where does the decimal point go? (a) 0.02871 (b) 2.871 (c) 0.2871 (d) 28.71
  19. 19.0.97 × 23 — where does the decimal point go? (a) 2.231 (b) 223.1 (c) 22.31 (d) 0.2231
  20. 20.1.9 × 35 — where does the decimal point go? (a) 0.665 (b) 665 (c) 66.5 (d) 6.65
  21. 21.8.1 × 4 — where does the decimal point go? (a) 32.4 (b) 3.24 (c) 0.324 (d) 324
  22. 22.1.9 × 0.6 — where does the decimal point go? (a) 11.4 (b) 0.114 (c) 0.0114 (d) 1.14
  23. 23.0.16 × 2.1 — where does the decimal point go? (a) 0.0336 (b) 0.00336 (c) 0.336 (d) 3.36
  24. 24.0.43 × 37 — where does the decimal point go? (a) 15.91 (b) 0.1591 (c) 1.591 (d) 159.1
  25. 25.0.34 × 3 — where does the decimal point go? (a) 1.02 (b) 10.2 (c) 0.0102 (d) 0.102
  26. 26.0.36 × 0.4 — where does the decimal point go? (a) 1.44 (b) 0.0144 (c) 0.00144 (d) 0.144
  27. 27.2.1 × 45 — where does the decimal point go? (a) 0.945 (b) 9.45 (c) 945 (d) 94.5
  28. 28.0.32 × 4 — where does the decimal point go? (a) 0.128 (b) 0.0128 (c) 12.8 (d) 1.28
  29. 29.5.4 × 3.2 — where does the decimal point go? (a) 0.1728 (b) 17.28 (c) 1.728 (d) 172.8
  30. 30.2.4 × 8 — where does the decimal point go? (a) 19.2 (b) 192 (c) 1.92 (d) 0.192
  31. 31.0.37 × 43 — where does the decimal point go? (a) 0.1591 (b) 1.591 (c) 15.91 (d) 159.1
  32. 32.0.84 × 2.6 — where does the decimal point go? (a) 2.184 (b) 0.2184 (c) 0.02184 (d) 21.84
  33. 33.0.57 × 48 — where does the decimal point go? (a) 2.736 (b) 27.36 (c) 273.6 (d) 0.2736
  34. 34.0.59 × 3 — where does the decimal point go? (a) 1.77 (b) 0.0177 (c) 17.7 (d) 0.177
  35. 35.6.4 × 17 — where does the decimal point go? (a) 108.8 (b) 10.88 (c) 1.088 (d) 1088
  36. 36.4.4 × 0.8 — where does the decimal point go? (a) 0.352 (b) 35.2 (c) 3.52 (d) 0.0352
  37. 37.0.12 × 6 — where does the decimal point go? (a) 0.72 (b) 0.072 (c) 7.2 (d) 0.0072
  38. 38.0.16 × 6 — where does the decimal point go? (a) 0.0096 (b) 0.096 (c) 9.6 (d) 0.96
  39. 39.8.1 × 6 — where does the decimal point go? (a) 0.486 (b) 48.6 (c) 4.86 (d) 486
  40. 40.0.58 × 1.7 — where does the decimal point go? (a) 0.00986 (b) 0.986 (c) 0.0986 (d) 9.86

Answer key

  1. 13.92
  2. 7.92
  3. 29.92
  4. 3.68
  5. 0.987
  6. 22.5
  7. 16.2
  8. 2.268
  9. 157.5
  10. 0.196
  11. 0.203
  12. 42.4
  13. 1.634
  14. 14.28
  15. 0.768
  16. 2.66
  17. 107.3
  18. 2.871
  19. 22.31
  20. 66.5
  21. 32.4
  22. 1.14
  23. 0.336
  24. 15.91
  25. 1.02
  26. 0.144
  27. 94.5
  28. 1.28
  29. 17.28
  30. 19.2
  31. 15.91
  32. 2.184
  33. 27.36
  34. 1.77
  35. 108.8
  36. 3.52
  37. 0.72
  38. 0.96
  39. 48.6
  40. 0.986

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