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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 703 · 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. 1.7.9 × 33 — where does the decimal point go? (a) 2607 (b) 26.07 (c) 2.607 (d) 260.7
  2. 2.0.18 × 0.8 — where does the decimal point go? (a) 1.44 (b) 0.0144 (c) 0.00144 (d) 0.144
  3. 3.8.9 × 19 — where does the decimal point go? (a) 169.1 (b) 1691 (c) 1.691 (d) 16.91
  4. 4.7.8 × 13 — where does the decimal point go? (a) 101.4 (b) 1.014 (c) 1014 (d) 10.14
  5. 5.1.2 × 21 — where does the decimal point go? (a) 252 (b) 25.2 (c) 0.252 (d) 2.52
  6. 6.9.7 × 3 — where does the decimal point go? (a) 0.291 (b) 29.1 (c) 2.91 (d) 291
  7. 7.1.2 × 0.4 — where does the decimal point go? (a) 4.8 (b) 0.048 (c) 0.48 (d) 0.0048
  8. 8.1.4 × 0.4 — where does the decimal point go? (a) 5.6 (b) 0.56 (c) 0.0056 (d) 0.056
  9. 9.5.4 × 2.1 — where does the decimal point go? (a) 1.134 (b) 113.4 (c) 0.1134 (d) 11.34
  10. 10.0.38 × 18 — where does the decimal point go? (a) 0.0684 (b) 68.4 (c) 6.84 (d) 0.684
  11. 11.0.17 × 0.7 — where does the decimal point go? (a) 0.119 (b) 1.19 (c) 0.00119 (d) 0.0119
  12. 12.0.47 × 29 — where does the decimal point go? (a) 0.1363 (b) 1.363 (c) 136.3 (d) 13.63
  13. 13.7.8 × 3.4 — where does the decimal point go? (a) 2.652 (b) 265.2 (c) 26.52 (d) 0.2652
  14. 14.0.13 × 2 — where does the decimal point go? (a) 0.026 (b) 0.0026 (c) 2.6 (d) 0.26
  15. 15.8.2 × 19 — where does the decimal point go? (a) 15.58 (b) 155.8 (c) 1558 (d) 1.558
  16. 16.0.55 × 3 — where does the decimal point go? (a) 1.65 (b) 16.5 (c) 0.0165 (d) 0.165
  17. 17.0.26 × 37 — where does the decimal point go? (a) 9.62 (b) 0.962 (c) 96.2 (d) 0.0962
  18. 18.8.1 × 5 — where does the decimal point go? (a) 40.5 (b) 4.05 (c) 405 (d) 0.405
  19. 19.0.26 × 2 — where does the decimal point go? (a) 0.052 (b) 5.2 (c) 0.0052 (d) 0.52
  20. 20.3.4 × 48 — where does the decimal point go? (a) 163.2 (b) 16.32 (c) 1632 (d) 1.632
  21. 21.0.81 × 9 — where does the decimal point go? (a) 7.29 (b) 0.729 (c) 72.9 (d) 0.0729
  22. 22.3.9 × 33 — where does the decimal point go? (a) 1.287 (b) 128.7 (c) 12.87 (d) 1287
  23. 23.0.17 × 2 — where does the decimal point go? (a) 0.034 (b) 0.34 (c) 3.4 (d) 0.0034
  24. 24.0.84 × 2.6 — where does the decimal point go? (a) 2.184 (b) 0.2184 (c) 0.02184 (d) 21.84
  25. 25.0.41 × 7 — where does the decimal point go? (a) 0.287 (b) 2.87 (c) 0.0287 (d) 28.7
  26. 26.0.28 × 8 — where does the decimal point go? (a) 2.24 (b) 22.4 (c) 0.0224 (d) 0.224
  27. 27.0.44 × 0.9 — where does the decimal point go? (a) 0.0396 (b) 0.00396 (c) 3.96 (d) 0.396
  28. 28.3.4 × 4.2 — where does the decimal point go? (a) 14.28 (b) 1.428 (c) 142.8 (d) 0.1428
  29. 29.2.7 × 44 — where does the decimal point go? (a) 11.88 (b) 1.188 (c) 118.8 (d) 1188
  30. 30.9.7 × 0.7 — where does the decimal point go? (a) 0.679 (b) 0.0679 (c) 6.79 (d) 67.9
  31. 31.2.2 × 22 — where does the decimal point go? (a) 48.4 (b) 0.484 (c) 484 (d) 4.84
  32. 32.0.43 × 2 — where does the decimal point go? (a) 0.086 (b) 8.6 (c) 0.86 (d) 0.0086
  33. 33.0.98 × 46 — where does the decimal point go? (a) 450.8 (b) 0.4508 (c) 4.508 (d) 45.08
  34. 34.2.3 × 0.6 — where does the decimal point go? (a) 0.0138 (b) 13.8 (c) 1.38 (d) 0.138
  35. 35.0.22 × 7 — where does the decimal point go? (a) 15.4 (b) 0.154 (c) 0.0154 (d) 1.54
  36. 36.6.2 × 42 — where does the decimal point go? (a) 2.604 (b) 260.4 (c) 26.04 (d) 2604
  37. 37.0.13 × 27 — where does the decimal point go? (a) 0.351 (b) 0.0351 (c) 3.51 (d) 35.1
  38. 38.4.3 × 0.9 — where does the decimal point go? (a) 38.7 (b) 0.0387 (c) 3.87 (d) 0.387
  39. 39.0.54 × 4 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 0.0216 (d) 21.6
  40. 40.0.47 × 1.1 — where does the decimal point go? (a) 0.0517 (b) 0.00517 (c) 0.517 (d) 5.17

Answer key

  1. 260.7
  2. 0.144
  3. 169.1
  4. 101.4
  5. 25.2
  6. 29.1
  7. 0.48
  8. 0.56
  9. 11.34
  10. 6.84
  11. 0.119
  12. 13.63
  13. 26.52
  14. 0.26
  15. 155.8
  16. 1.65
  17. 9.62
  18. 40.5
  19. 0.52
  20. 163.2
  21. 7.29
  22. 128.7
  23. 0.34
  24. 2.184
  25. 2.87
  26. 2.24
  27. 0.396
  28. 14.28
  29. 118.8
  30. 6.79
  31. 48.4
  32. 0.86
  33. 45.08
  34. 1.38
  35. 1.54
  36. 260.4
  37. 3.51
  38. 3.87
  39. 2.16
  40. 0.517

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