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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 904 · 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. 1.3.3 × 1.1 — where does the decimal point go? (a) 0.0363 (b) 3.63 (c) 0.363 (d) 36.3
  2. 2.0.88 × 7 — where does the decimal point go? (a) 0.616 (b) 6.16 (c) 0.0616 (d) 61.6
  3. 3.7.4 × 38 — where does the decimal point go? (a) 28.12 (b) 2812 (c) 2.812 (d) 281.2
  4. 4.1.6 × 3.1 — where does the decimal point go? (a) 4.96 (b) 0.496 (c) 49.6 (d) 0.0496
  5. 5.0.43 × 2.3 — where does the decimal point go? (a) 0.989 (b) 9.89 (c) 0.00989 (d) 0.0989
  6. 6.1.7 × 3.8 — where does the decimal point go? (a) 0.0646 (b) 0.646 (c) 6.46 (d) 64.6
  7. 7.9.8 × 14 — where does the decimal point go? (a) 1.372 (b) 1372 (c) 13.72 (d) 137.2
  8. 8.8.6 × 4.2 — where does the decimal point go? (a) 36.12 (b) 0.3612 (c) 361.2 (d) 3.612
  9. 9.0.42 × 1.1 — where does the decimal point go? (a) 0.462 (b) 4.62 (c) 0.0462 (d) 0.00462
  10. 10.2.9 × 7 — where does the decimal point go? (a) 203 (b) 2.03 (c) 20.3 (d) 0.203
  11. 11.0.62 × 4 — where does the decimal point go? (a) 24.8 (b) 0.0248 (c) 2.48 (d) 0.248
  12. 12.0.44 × 7 — where does the decimal point go? (a) 0.0308 (b) 30.8 (c) 3.08 (d) 0.308
  13. 13.5.3 × 21 — where does the decimal point go? (a) 111.3 (b) 11.13 (c) 1.113 (d) 1113
  14. 14.7.6 × 0.2 — where does the decimal point go? (a) 15.2 (b) 1.52 (c) 0.152 (d) 0.0152
  15. 15.0.97 × 4.3 — where does the decimal point go? (a) 4.171 (b) 0.04171 (c) 0.4171 (d) 41.71
  16. 16.7.3 × 42 — where does the decimal point go? (a) 3.066 (b) 30.66 (c) 306.6 (d) 3066
  17. 17.0.23 × 0.4 — where does the decimal point go? (a) 0.092 (b) 0.0092 (c) 0.00092 (d) 0.92
  18. 18.0.58 × 0.8 — where does the decimal point go? (a) 0.00464 (b) 4.64 (c) 0.0464 (d) 0.464
  19. 19.1.8 × 29 — where does the decimal point go? (a) 5.22 (b) 0.522 (c) 52.2 (d) 522
  20. 20.0.15 × 3 — where does the decimal point go? (a) 0.45 (b) 0.045 (c) 4.5 (d) 0.0045
  21. 21.0.19 × 4 — where does the decimal point go? (a) 0.76 (b) 0.076 (c) 0.0076 (d) 7.6
  22. 22.0.18 × 0.9 — where does the decimal point go? (a) 0.00162 (b) 0.0162 (c) 1.62 (d) 0.162
  23. 23.0.31 × 0.5 — where does the decimal point go? (a) 0.00155 (b) 1.55 (c) 0.0155 (d) 0.155
  24. 24.0.41 × 45 — where does the decimal point go? (a) 0.1845 (b) 18.45 (c) 184.5 (d) 1.845
  25. 25.0.82 × 0.4 — where does the decimal point go? (a) 0.0328 (b) 0.00328 (c) 3.28 (d) 0.328
  26. 26.0.57 × 5 — where does the decimal point go? (a) 0.0285 (b) 28.5 (c) 0.285 (d) 2.85
  27. 27.5.6 × 43 — where does the decimal point go? (a) 2.408 (b) 24.08 (c) 2408 (d) 240.8
  28. 28.9.7 × 33 — where does the decimal point go? (a) 32.01 (b) 320.1 (c) 3201 (d) 3.201
  29. 29.0.89 × 3 — where does the decimal point go? (a) 2.67 (b) 0.267 (c) 0.0267 (d) 26.7
  30. 30.0.97 × 2.6 — where does the decimal point go? (a) 25.22 (b) 0.02522 (c) 2.522 (d) 0.2522
  31. 31.2.5 × 0.3 — where does the decimal point go? (a) 0.075 (b) 7.5 (c) 0.75 (d) 0.0075
  32. 32.0.57 × 0.4 — where does the decimal point go? (a) 0.0228 (b) 2.28 (c) 0.00228 (d) 0.228
  33. 33.0.81 × 19 — where does the decimal point go? (a) 15.39 (b) 0.1539 (c) 153.9 (d) 1.539
  34. 34.6.5 × 1.9 — where does the decimal point go? (a) 12.35 (b) 1.235 (c) 0.1235 (d) 123.5
  35. 35.1.2 × 7 — where does the decimal point go? (a) 0.84 (b) 0.084 (c) 8.4 (d) 84
  36. 36.0.71 × 1.4 — where does the decimal point go? (a) 0.0994 (b) 0.994 (c) 0.00994 (d) 9.94
  37. 37.9.1 × 13 — where does the decimal point go? (a) 1.183 (b) 1183 (c) 11.83 (d) 118.3
  38. 38.0.61 × 0.9 — where does the decimal point go? (a) 0.549 (b) 0.00549 (c) 0.0549 (d) 5.49
  39. 39.9.1 × 7 — where does the decimal point go? (a) 63.7 (b) 6.37 (c) 0.637 (d) 637
  40. 40.0.37 × 0.4 — where does the decimal point go? (a) 0.148 (b) 0.0148 (c) 0.00148 (d) 1.48

Answer key

  1. 3.63
  2. 6.16
  3. 281.2
  4. 4.96
  5. 0.989
  6. 6.46
  7. 137.2
  8. 36.12
  9. 0.462
  10. 20.3
  11. 2.48
  12. 3.08
  13. 111.3
  14. 1.52
  15. 4.171
  16. 306.6
  17. 0.092
  18. 0.464
  19. 52.2
  20. 0.45
  21. 0.76
  22. 0.162
  23. 0.155
  24. 18.45
  25. 0.328
  26. 2.85
  27. 240.8
  28. 320.1
  29. 2.67
  30. 2.522
  31. 0.75
  32. 0.228
  33. 15.39
  34. 12.35
  35. 8.4
  36. 0.994
  37. 118.3
  38. 0.549
  39. 63.7
  40. 0.148

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