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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 913 · 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. 1.0.72 × 4 — where does the decimal point go? (a) 2.88 (b) 0.288 (c) 28.8 (d) 0.0288
  2. 2.3.2 × 0.7 — where does the decimal point go? (a) 2.24 (b) 22.4 (c) 0.0224 (d) 0.224
  3. 3.9.3 × 23 — where does the decimal point go? (a) 2.139 (b) 21.39 (c) 213.9 (d) 2139
  4. 4.5.7 × 0.3 — where does the decimal point go? (a) 0.0171 (b) 0.171 (c) 17.1 (d) 1.71
  5. 5.2.8 × 42 — where does the decimal point go? (a) 1.176 (b) 117.6 (c) 11.76 (d) 1176
  6. 6.8.8 × 16 — where does the decimal point go? (a) 1408 (b) 140.8 (c) 1.408 (d) 14.08
  7. 7.1.8 × 9 — where does the decimal point go? (a) 0.162 (b) 1.62 (c) 162 (d) 16.2
  8. 8.3.9 × 0.5 — where does the decimal point go? (a) 0.0195 (b) 1.95 (c) 0.195 (d) 19.5
  9. 9.0.53 × 45 — where does the decimal point go? (a) 23.85 (b) 2.385 (c) 0.2385 (d) 238.5
  10. 10.0.93 × 25 — where does the decimal point go? (a) 0.2325 (b) 232.5 (c) 2.325 (d) 23.25
  11. 11.0.97 × 0.6 — where does the decimal point go? (a) 0.00582 (b) 0.0582 (c) 5.82 (d) 0.582
  12. 12.0.34 × 3 — where does the decimal point go? (a) 10.2 (b) 0.102 (c) 1.02 (d) 0.0102
  13. 13.6.7 × 0.2 — where does the decimal point go? (a) 0.0134 (b) 0.134 (c) 1.34 (d) 13.4
  14. 14.1.3 × 16 — where does the decimal point go? (a) 208 (b) 0.208 (c) 2.08 (d) 20.8
  15. 15.0.32 × 2.2 — where does the decimal point go? (a) 7.04 (b) 0.0704 (c) 0.00704 (d) 0.704
  16. 16.0.19 × 0.5 — where does the decimal point go? (a) 0.95 (b) 0.0095 (c) 0.095 (d) 0.00095
  17. 17.0.14 × 2 — where does the decimal point go? (a) 0.0028 (b) 0.28 (c) 2.8 (d) 0.028
  18. 18.4.1 × 1.2 — where does the decimal point go? (a) 4.92 (b) 0.0492 (c) 0.492 (d) 49.2
  19. 19.9.6 × 9 — where does the decimal point go? (a) 864 (b) 0.864 (c) 8.64 (d) 86.4
  20. 20.0.73 × 4.9 — where does the decimal point go? (a) 35.77 (b) 0.03577 (c) 0.3577 (d) 3.577
  21. 21.0.42 × 13 — where does the decimal point go? (a) 0.546 (b) 5.46 (c) 0.0546 (d) 54.6
  22. 22.2.9 × 7 — where does the decimal point go? (a) 0.203 (b) 2.03 (c) 203 (d) 20.3
  23. 23.0.93 × 4.9 — where does the decimal point go? (a) 0.04557 (b) 45.57 (c) 4.557 (d) 0.4557
  24. 24.7.9 × 8 — where does the decimal point go? (a) 0.632 (b) 63.2 (c) 632 (d) 6.32
  25. 25.2.8 × 3 — where does the decimal point go? (a) 0.84 (b) 8.4 (c) 0.084 (d) 84
  26. 26.3.1 × 19 — where does the decimal point go? (a) 589 (b) 0.589 (c) 5.89 (d) 58.9
  27. 27.7.1 × 0.7 — where does the decimal point go? (a) 4.97 (b) 0.0497 (c) 0.497 (d) 49.7
  28. 28.5.1 × 14 — where does the decimal point go? (a) 7.14 (b) 0.714 (c) 71.4 (d) 714
  29. 29.0.31 × 4.8 — where does the decimal point go? (a) 0.01488 (b) 0.1488 (c) 14.88 (d) 1.488
  30. 30.0.79 × 11 — where does the decimal point go? (a) 0.869 (b) 8.69 (c) 0.0869 (d) 86.9
  31. 31.3.2 × 3.1 — where does the decimal point go? (a) 0.0992 (b) 0.992 (c) 99.2 (d) 9.92
  32. 32.0.47 × 8 — where does the decimal point go? (a) 37.6 (b) 0.0376 (c) 0.376 (d) 3.76
  33. 33.1.9 × 2.2 — where does the decimal point go? (a) 0.0418 (b) 4.18 (c) 0.418 (d) 41.8
  34. 34.0.77 × 8 — where does the decimal point go? (a) 6.16 (b) 0.616 (c) 0.0616 (d) 61.6
  35. 35.0.77 × 16 — where does the decimal point go? (a) 12.32 (b) 1.232 (c) 123.2 (d) 0.1232
  36. 36.0.35 × 1.7 — where does the decimal point go? (a) 0.595 (b) 5.95 (c) 0.0595 (d) 0.00595
  37. 37.0.47 × 5 — where does the decimal point go? (a) 0.235 (b) 2.35 (c) 0.0235 (d) 23.5
  38. 38.6.5 × 2.1 — where does the decimal point go? (a) 0.1365 (b) 1.365 (c) 136.5 (d) 13.65
  39. 39.3.1 × 3.9 — where does the decimal point go? (a) 0.1209 (b) 120.9 (c) 1.209 (d) 12.09
  40. 40.1.5 × 25 — where does the decimal point go? (a) 3.75 (b) 375 (c) 37.5 (d) 0.375

Answer key

  1. 2.88
  2. 2.24
  3. 213.9
  4. 1.71
  5. 117.6
  6. 140.8
  7. 16.2
  8. 1.95
  9. 23.85
  10. 23.25
  11. 0.582
  12. 1.02
  13. 1.34
  14. 20.8
  15. 0.704
  16. 0.095
  17. 0.28
  18. 4.92
  19. 86.4
  20. 3.577
  21. 5.46
  22. 20.3
  23. 4.557
  24. 63.2
  25. 8.4
  26. 58.9
  27. 4.97
  28. 71.4
  29. 1.488
  30. 8.69
  31. 9.92
  32. 3.76
  33. 4.18
  34. 6.16
  35. 12.32
  36. 0.595
  37. 2.35
  38. 13.65
  39. 12.09
  40. 37.5

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