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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 399 · 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. 1.0.43 × 3 — where does the decimal point go? (a) 1.29 (b) 0.129 (c) 0.0129 (d) 12.9
  2. 2.0.12 × 2 — where does the decimal point go? (a) 2.4 (b) 0.0024 (c) 0.24 (d) 0.024
  3. 3.0.25 × 9 — where does the decimal point go? (a) 22.5 (b) 0.225 (c) 0.0225 (d) 2.25
  4. 4.8.3 × 9 — where does the decimal point go? (a) 747 (b) 74.7 (c) 7.47 (d) 0.747
  5. 5.0.54 × 18 — where does the decimal point go? (a) 0.0972 (b) 9.72 (c) 0.972 (d) 97.2
  6. 6.8.2 × 2 — where does the decimal point go? (a) 16.4 (b) 164 (c) 0.164 (d) 1.64
  7. 7.7.9 × 1.4 — where does the decimal point go? (a) 1.106 (b) 110.6 (c) 11.06 (d) 0.1106
  8. 8.5.5 × 0.3 — where does the decimal point go? (a) 1.65 (b) 16.5 (c) 0.0165 (d) 0.165
  9. 9.0.86 × 2.2 — where does the decimal point go? (a) 0.01892 (b) 1.892 (c) 0.1892 (d) 18.92
  10. 10.0.68 × 4 — where does the decimal point go? (a) 0.0272 (b) 2.72 (c) 0.272 (d) 27.2
  11. 11.0.34 × 0.3 — where does the decimal point go? (a) 0.0102 (b) 1.02 (c) 0.00102 (d) 0.102
  12. 12.2.8 × 3 — where does the decimal point go? (a) 0.084 (b) 84 (c) 0.84 (d) 8.4
  13. 13.4.9 × 21 — where does the decimal point go? (a) 1.029 (b) 102.9 (c) 10.29 (d) 1029
  14. 14.0.69 × 49 — where does the decimal point go? (a) 0.3381 (b) 338.1 (c) 33.81 (d) 3.381
  15. 15.0.91 × 0.8 — where does the decimal point go? (a) 0.728 (b) 0.0728 (c) 7.28 (d) 0.00728
  16. 16.8.1 × 8 — where does the decimal point go? (a) 64.8 (b) 648 (c) 6.48 (d) 0.648
  17. 17.6.3 × 48 — where does the decimal point go? (a) 30.24 (b) 302.4 (c) 3024 (d) 3.024
  18. 18.8.7 × 0.4 — where does the decimal point go? (a) 34.8 (b) 0.348 (c) 0.0348 (d) 3.48
  19. 19.0.99 × 6 — where does the decimal point go? (a) 5.94 (b) 59.4 (c) 0.0594 (d) 0.594
  20. 20.0.54 × 9 — where does the decimal point go? (a) 48.6 (b) 4.86 (c) 0.486 (d) 0.0486
  21. 21.5.9 × 0.2 — where does the decimal point go? (a) 1.18 (b) 0.118 (c) 11.8 (d) 0.0118
  22. 22.4.3 × 2.7 — where does the decimal point go? (a) 11.61 (b) 1.161 (c) 116.1 (d) 0.1161
  23. 23.0.89 × 24 — where does the decimal point go? (a) 21.36 (b) 213.6 (c) 2.136 (d) 0.2136
  24. 24.0.19 × 4.6 — where does the decimal point go? (a) 0.874 (b) 0.0874 (c) 0.00874 (d) 8.74
  25. 25.3.8 × 39 — where does the decimal point go? (a) 1.482 (b) 148.2 (c) 1482 (d) 14.82
  26. 26.0.56 × 3.1 — where does the decimal point go? (a) 0.01736 (b) 0.1736 (c) 17.36 (d) 1.736
  27. 27.9.5 × 0.7 — where does the decimal point go? (a) 0.665 (b) 0.0665 (c) 66.5 (d) 6.65
  28. 28.0.45 × 9 — where does the decimal point go? (a) 0.0405 (b) 40.5 (c) 0.405 (d) 4.05
  29. 29.0.52 × 41 — where does the decimal point go? (a) 0.2132 (b) 21.32 (c) 2.132 (d) 213.2
  30. 30.0.31 × 4.7 — where does the decimal point go? (a) 14.57 (b) 0.1457 (c) 1.457 (d) 0.01457
  31. 31.0.46 × 0.3 — where does the decimal point go? (a) 0.138 (b) 1.38 (c) 0.0138 (d) 0.00138
  32. 32.2.4 × 4 — where does the decimal point go? (a) 9.6 (b) 96 (c) 0.96 (d) 0.096
  33. 33.5.7 × 45 — where does the decimal point go? (a) 25.65 (b) 256.5 (c) 2.565 (d) 2565
  34. 34.5.4 × 26 — where does the decimal point go? (a) 1.404 (b) 1404 (c) 14.04 (d) 140.4
  35. 35.8.2 × 3 — where does the decimal point go? (a) 0.246 (b) 246 (c) 2.46 (d) 24.6
  36. 36.6.3 × 43 — where does the decimal point go? (a) 2709 (b) 270.9 (c) 2.709 (d) 27.09
  37. 37.1.4 × 3.1 — where does the decimal point go? (a) 0.434 (b) 4.34 (c) 43.4 (d) 0.0434
  38. 38.2.6 × 16 — where does the decimal point go? (a) 41.6 (b) 4.16 (c) 0.416 (d) 416
  39. 39.5.4 × 19 — where does the decimal point go? (a) 1.026 (b) 10.26 (c) 1026 (d) 102.6
  40. 40.3.1 × 0.4 — where does the decimal point go? (a) 0.124 (b) 12.4 (c) 1.24 (d) 0.0124

Answer key

  1. 1.29
  2. 0.24
  3. 2.25
  4. 74.7
  5. 9.72
  6. 16.4
  7. 11.06
  8. 1.65
  9. 1.892
  10. 2.72
  11. 0.102
  12. 8.4
  13. 102.9
  14. 33.81
  15. 0.728
  16. 64.8
  17. 302.4
  18. 3.48
  19. 5.94
  20. 4.86
  21. 1.18
  22. 11.61
  23. 21.36
  24. 0.874
  25. 148.2
  26. 1.736
  27. 6.65
  28. 4.05
  29. 21.32
  30. 1.457
  31. 0.138
  32. 9.6
  33. 256.5
  34. 140.4
  35. 24.6
  36. 270.9
  37. 4.34
  38. 41.6
  39. 102.6
  40. 1.24

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