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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 394 · 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. 1.0.89 × 0.2 — where does the decimal point go? (a) 0.00178 (b) 0.178 (c) 0.0178 (d) 1.78
  2. 2.7.7 × 8 — where does the decimal point go? (a) 0.616 (b) 61.6 (c) 616 (d) 6.16
  3. 3.0.27 × 8 — where does the decimal point go? (a) 2.16 (b) 0.216 (c) 21.6 (d) 0.0216
  4. 4.4.1 × 17 — where does the decimal point go? (a) 697 (b) 69.7 (c) 0.697 (d) 6.97
  5. 5.0.31 × 12 — where does the decimal point go? (a) 0.0372 (b) 37.2 (c) 3.72 (d) 0.372
  6. 6.0.99 × 4.9 — where does the decimal point go? (a) 4.851 (b) 0.4851 (c) 48.51 (d) 0.04851
  7. 7.3.3 × 3.1 — where does the decimal point go? (a) 0.1023 (b) 10.23 (c) 1.023 (d) 102.3
  8. 8.0.43 × 13 — where does the decimal point go? (a) 5.59 (b) 0.559 (c) 0.0559 (d) 55.9
  9. 9.4.1 × 2 — where does the decimal point go? (a) 82 (b) 0.082 (c) 0.82 (d) 8.2
  10. 10.5.5 × 2.9 — where does the decimal point go? (a) 15.95 (b) 1.595 (c) 0.1595 (d) 159.5
  11. 11.3.9 × 1.7 — where does the decimal point go? (a) 0.0663 (b) 6.63 (c) 66.3 (d) 0.663
  12. 12.0.16 × 2.6 — where does the decimal point go? (a) 0.0416 (b) 4.16 (c) 0.00416 (d) 0.416
  13. 13.5.4 × 34 — where does the decimal point go? (a) 1836 (b) 1.836 (c) 183.6 (d) 18.36
  14. 14.4.5 × 2.7 — where does the decimal point go? (a) 12.15 (b) 1.215 (c) 121.5 (d) 0.1215
  15. 15.0.67 × 2 — where does the decimal point go? (a) 0.0134 (b) 13.4 (c) 1.34 (d) 0.134
  16. 16.7.1 × 9 — where does the decimal point go? (a) 63.9 (b) 6.39 (c) 639 (d) 0.639
  17. 17.9.7 × 3.9 — where does the decimal point go? (a) 37.83 (b) 0.3783 (c) 378.3 (d) 3.783
  18. 18.4.3 × 23 — where does the decimal point go? (a) 989 (b) 0.989 (c) 9.89 (d) 98.9
  19. 19.4.1 × 6 — where does the decimal point go? (a) 24.6 (b) 2.46 (c) 246 (d) 0.246
  20. 20.0.92 × 1.1 — where does the decimal point go? (a) 1.012 (b) 0.01012 (c) 0.1012 (d) 10.12
  21. 21.0.23 × 2 — where does the decimal point go? (a) 0.46 (b) 0.0046 (c) 0.046 (d) 4.6
  22. 22.6.5 × 25 — where does the decimal point go? (a) 162.5 (b) 16.25 (c) 1625 (d) 1.625
  23. 23.5.4 × 2.6 — where does the decimal point go? (a) 140.4 (b) 0.1404 (c) 14.04 (d) 1.404
  24. 24.0.67 × 4 — where does the decimal point go? (a) 2.68 (b) 26.8 (c) 0.0268 (d) 0.268
  25. 25.0.46 × 4 — where does the decimal point go? (a) 0.0184 (b) 1.84 (c) 18.4 (d) 0.184
  26. 26.9.3 × 5 — where does the decimal point go? (a) 0.465 (b) 4.65 (c) 465 (d) 46.5
  27. 27.6.7 × 5 — where does the decimal point go? (a) 3.35 (b) 33.5 (c) 335 (d) 0.335
  28. 28.0.76 × 46 — where does the decimal point go? (a) 34.96 (b) 349.6 (c) 0.3496 (d) 3.496
  29. 29.9.2 × 46 — where does the decimal point go? (a) 4.232 (b) 423.2 (c) 42.32 (d) 4232
  30. 30.3.7 × 7 — where does the decimal point go? (a) 25.9 (b) 259 (c) 0.259 (d) 2.59
  31. 31.0.38 × 3 — where does the decimal point go? (a) 0.114 (b) 0.0114 (c) 11.4 (d) 1.14
  32. 32.3.9 × 0.5 — where does the decimal point go? (a) 1.95 (b) 0.0195 (c) 19.5 (d) 0.195
  33. 33.3.1 × 0.5 — where does the decimal point go? (a) 15.5 (b) 0.0155 (c) 1.55 (d) 0.155
  34. 34.2.8 × 0.4 — where does the decimal point go? (a) 1.12 (b) 0.0112 (c) 11.2 (d) 0.112
  35. 35.0.13 × 8 — where does the decimal point go? (a) 1.04 (b) 0.104 (c) 0.0104 (d) 10.4
  36. 36.0.86 × 7 — where does the decimal point go? (a) 0.0602 (b) 60.2 (c) 0.602 (d) 6.02
  37. 37.3.2 × 9 — where does the decimal point go? (a) 0.288 (b) 288 (c) 2.88 (d) 28.8
  38. 38.0.22 × 33 — where does the decimal point go? (a) 0.726 (b) 0.0726 (c) 7.26 (d) 72.6
  39. 39.0.82 × 47 — where does the decimal point go? (a) 385.4 (b) 0.3854 (c) 3.854 (d) 38.54
  40. 40.1.7 × 0.5 — where does the decimal point go? (a) 0.85 (b) 0.085 (c) 0.0085 (d) 8.5

Answer key

  1. 0.178
  2. 61.6
  3. 2.16
  4. 69.7
  5. 3.72
  6. 4.851
  7. 10.23
  8. 5.59
  9. 8.2
  10. 15.95
  11. 6.63
  12. 0.416
  13. 183.6
  14. 12.15
  15. 1.34
  16. 63.9
  17. 37.83
  18. 98.9
  19. 24.6
  20. 1.012
  21. 0.46
  22. 162.5
  23. 14.04
  24. 2.68
  25. 1.84
  26. 46.5
  27. 33.5
  28. 34.96
  29. 423.2
  30. 25.9
  31. 1.14
  32. 1.95
  33. 1.55
  34. 1.12
  35. 1.04
  36. 6.02
  37. 28.8
  38. 7.26
  39. 38.54
  40. 0.85

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