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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 899 · 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. 1.0.78 × 0.7 — where does the decimal point go? (a) 0.00546 (b) 0.546 (c) 0.0546 (d) 5.46
  2. 2.0.34 × 14 — where does the decimal point go? (a) 4.76 (b) 0.0476 (c) 0.476 (d) 47.6
  3. 3.0.64 × 1.3 — where does the decimal point go? (a) 0.00832 (b) 8.32 (c) 0.0832 (d) 0.832
  4. 4.5.1 × 6 — where does the decimal point go? (a) 30.6 (b) 306 (c) 3.06 (d) 0.306
  5. 5.2.2 × 2.2 — where does the decimal point go? (a) 48.4 (b) 0.484 (c) 0.0484 (d) 4.84
  6. 6.0.35 × 0.7 — where does the decimal point go? (a) 0.245 (b) 0.00245 (c) 0.0245 (d) 2.45
  7. 7.0.37 × 5 — where does the decimal point go? (a) 0.185 (b) 0.0185 (c) 18.5 (d) 1.85
  8. 8.7.4 × 4 — where does the decimal point go? (a) 296 (b) 0.296 (c) 2.96 (d) 29.6
  9. 9.0.64 × 4.2 — where does the decimal point go? (a) 0.02688 (b) 0.2688 (c) 26.88 (d) 2.688
  10. 10.6.6 × 11 — where does the decimal point go? (a) 0.726 (b) 726 (c) 7.26 (d) 72.6
  11. 11.3.8 × 4 — where does the decimal point go? (a) 1.52 (b) 15.2 (c) 152 (d) 0.152
  12. 12.0.71 × 0.3 — where does the decimal point go? (a) 2.13 (b) 0.0213 (c) 0.213 (d) 0.00213
  13. 13.1.9 × 34 — where does the decimal point go? (a) 6.46 (b) 64.6 (c) 0.646 (d) 646
  14. 14.0.67 × 28 — where does the decimal point go? (a) 1.876 (b) 0.1876 (c) 187.6 (d) 18.76
  15. 15.6.6 × 7 — where does the decimal point go? (a) 46.2 (b) 0.462 (c) 4.62 (d) 462
  16. 16.0.19 × 19 — where does the decimal point go? (a) 0.0361 (b) 36.1 (c) 3.61 (d) 0.361
  17. 17.7.6 × 7 — where does the decimal point go? (a) 532 (b) 5.32 (c) 53.2 (d) 0.532
  18. 18.0.94 × 4 — where does the decimal point go? (a) 0.0376 (b) 3.76 (c) 0.376 (d) 37.6
  19. 19.0.91 × 4 — where does the decimal point go? (a) 0.0364 (b) 3.64 (c) 0.364 (d) 36.4
  20. 20.9.6 × 36 — where does the decimal point go? (a) 345.6 (b) 3456 (c) 34.56 (d) 3.456
  21. 21.0.47 × 33 — where does the decimal point go? (a) 15.51 (b) 1.551 (c) 0.1551 (d) 155.1
  22. 22.0.72 × 9 — where does the decimal point go? (a) 6.48 (b) 64.8 (c) 0.648 (d) 0.0648
  23. 23.5.3 × 12 — where does the decimal point go? (a) 63.6 (b) 6.36 (c) 636 (d) 0.636
  24. 24.3.9 × 15 — where does the decimal point go? (a) 0.585 (b) 585 (c) 5.85 (d) 58.5
  25. 25.4.2 × 4 — where does the decimal point go? (a) 1.68 (b) 0.168 (c) 16.8 (d) 168
  26. 26.1.6 × 0.4 — where does the decimal point go? (a) 0.64 (b) 0.0064 (c) 0.064 (d) 6.4
  27. 27.0.29 × 8 — where does the decimal point go? (a) 0.232 (b) 23.2 (c) 0.0232 (d) 2.32
  28. 28.4.6 × 9 — where does the decimal point go? (a) 4.14 (b) 41.4 (c) 414 (d) 0.414
  29. 29.6.2 × 2.2 — where does the decimal point go? (a) 1.364 (b) 0.1364 (c) 13.64 (d) 136.4
  30. 30.0.85 × 0.7 — where does the decimal point go? (a) 0.00595 (b) 0.0595 (c) 5.95 (d) 0.595
  31. 31.0.64 × 11 — where does the decimal point go? (a) 0.0704 (b) 70.4 (c) 0.704 (d) 7.04
  32. 32.9.4 × 2 — where does the decimal point go? (a) 18.8 (b) 0.188 (c) 1.88 (d) 188
  33. 33.9.1 × 5 — where does the decimal point go? (a) 4.55 (b) 0.455 (c) 45.5 (d) 455
  34. 34.6.8 × 2 — where does the decimal point go? (a) 1.36 (b) 136 (c) 0.136 (d) 13.6
  35. 35.4.4 × 39 — where does the decimal point go? (a) 1.716 (b) 17.16 (c) 1716 (d) 171.6
  36. 36.0.17 × 48 — where does the decimal point go? (a) 81.6 (b) 0.816 (c) 0.0816 (d) 8.16
  37. 37.0.88 × 2.1 — where does the decimal point go? (a) 0.1848 (b) 18.48 (c) 0.01848 (d) 1.848
  38. 38.0.29 × 0.7 — where does the decimal point go? (a) 0.203 (b) 0.0203 (c) 2.03 (d) 0.00203
  39. 39.5.2 × 3 — where does the decimal point go? (a) 0.156 (b) 1.56 (c) 15.6 (d) 156
  40. 40.4.1 × 3 — where does the decimal point go? (a) 0.123 (b) 123 (c) 12.3 (d) 1.23

Answer key

  1. 0.546
  2. 4.76
  3. 0.832
  4. 30.6
  5. 4.84
  6. 0.245
  7. 1.85
  8. 29.6
  9. 2.688
  10. 72.6
  11. 15.2
  12. 0.213
  13. 64.6
  14. 18.76
  15. 46.2
  16. 3.61
  17. 53.2
  18. 3.76
  19. 3.64
  20. 345.6
  21. 15.51
  22. 6.48
  23. 63.6
  24. 58.5
  25. 16.8
  26. 0.64
  27. 2.32
  28. 41.4
  29. 13.64
  30. 0.595
  31. 7.04
  32. 18.8
  33. 45.5
  34. 13.6
  35. 171.6
  36. 8.16
  37. 1.848
  38. 0.203
  39. 15.6
  40. 12.3

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