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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 686 · 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. 1.2.3 × 15 — where does the decimal point go? (a) 3.45 (b) 34.5 (c) 0.345 (d) 345
  2. 2.0.13 × 15 — where does the decimal point go? (a) 0.0195 (b) 1.95 (c) 0.195 (d) 19.5
  3. 3.0.35 × 3 — where does the decimal point go? (a) 10.5 (b) 1.05 (c) 0.105 (d) 0.0105
  4. 4.6.9 × 1.4 — where does the decimal point go? (a) 96.6 (b) 0.0966 (c) 9.66 (d) 0.966
  5. 5.0.24 × 3 — where does the decimal point go? (a) 0.0072 (b) 0.072 (c) 0.72 (d) 7.2
  6. 6.0.31 × 41 — where does the decimal point go? (a) 1.271 (b) 0.1271 (c) 127.1 (d) 12.71
  7. 7.0.33 × 0.5 — where does the decimal point go? (a) 0.165 (b) 0.0165 (c) 1.65 (d) 0.00165
  8. 8.9.8 × 39 — where does the decimal point go? (a) 3.822 (b) 382.2 (c) 38.22 (d) 3822
  9. 9.6.7 × 44 — where does the decimal point go? (a) 29.48 (b) 2948 (c) 2.948 (d) 294.8
  10. 10.8.9 × 4.1 — where does the decimal point go? (a) 3.649 (b) 0.3649 (c) 364.9 (d) 36.49
  11. 11.0.41 × 3.4 — where does the decimal point go? (a) 0.1394 (b) 0.01394 (c) 1.394 (d) 13.94
  12. 12.0.88 × 2.6 — where does the decimal point go? (a) 0.2288 (b) 2.288 (c) 0.02288 (d) 22.88
  13. 13.0.83 × 4 — where does the decimal point go? (a) 33.2 (b) 3.32 (c) 0.332 (d) 0.0332
  14. 14.8.2 × 21 — where does the decimal point go? (a) 1.722 (b) 172.2 (c) 17.22 (d) 1722
  15. 15.0.44 × 3.9 — where does the decimal point go? (a) 17.16 (b) 0.1716 (c) 1.716 (d) 0.01716
  16. 16.0.23 × 3 — where does the decimal point go? (a) 0.0069 (b) 0.69 (c) 6.9 (d) 0.069
  17. 17.0.12 × 3 — where does the decimal point go? (a) 0.36 (b) 0.0036 (c) 3.6 (d) 0.036
  18. 18.6.9 × 0.2 — where does the decimal point go? (a) 0.0138 (b) 0.138 (c) 13.8 (d) 1.38
  19. 19.2.4 × 38 — where does the decimal point go? (a) 9.12 (b) 0.912 (c) 912 (d) 91.2
  20. 20.3.9 × 42 — where does the decimal point go? (a) 163.8 (b) 1638 (c) 16.38 (d) 1.638
  21. 21.0.77 × 2.9 — where does the decimal point go? (a) 2.233 (b) 0.2233 (c) 0.02233 (d) 22.33
  22. 22.3.9 × 3 — where does the decimal point go? (a) 117 (b) 1.17 (c) 0.117 (d) 11.7
  23. 23.0.16 × 6 — where does the decimal point go? (a) 0.96 (b) 0.096 (c) 9.6 (d) 0.0096
  24. 24.3.3 × 0.6 — where does the decimal point go? (a) 1.98 (b) 0.198 (c) 0.0198 (d) 19.8
  25. 25.2.6 × 8 — where does the decimal point go? (a) 208 (b) 0.208 (c) 20.8 (d) 2.08
  26. 26.0.18 × 6 — where does the decimal point go? (a) 0.108 (b) 1.08 (c) 10.8 (d) 0.0108
  27. 27.5.2 × 0.3 — where does the decimal point go? (a) 0.156 (b) 15.6 (c) 1.56 (d) 0.0156
  28. 28.0.78 × 29 — where does the decimal point go? (a) 22.62 (b) 2.262 (c) 0.2262 (d) 226.2
  29. 29.2.4 × 16 — where does the decimal point go? (a) 384 (b) 3.84 (c) 0.384 (d) 38.4
  30. 30.2.7 × 4 — where does the decimal point go? (a) 108 (b) 0.108 (c) 10.8 (d) 1.08
  31. 31.2.9 × 0.9 — where does the decimal point go? (a) 26.1 (b) 2.61 (c) 0.0261 (d) 0.261
  32. 32.6.1 × 0.2 — where does the decimal point go? (a) 1.22 (b) 0.122 (c) 0.0122 (d) 12.2
  33. 33.0.68 × 4 — where does the decimal point go? (a) 0.0272 (b) 27.2 (c) 0.272 (d) 2.72
  34. 34.0.22 × 7 — where does the decimal point go? (a) 15.4 (b) 1.54 (c) 0.154 (d) 0.0154
  35. 35.0.33 × 19 — where does the decimal point go? (a) 0.0627 (b) 0.627 (c) 6.27 (d) 62.7
  36. 36.0.19 × 1.6 — where does the decimal point go? (a) 3.04 (b) 0.0304 (c) 0.304 (d) 0.00304
  37. 37.7.3 × 0.3 — where does the decimal point go? (a) 0.0219 (b) 2.19 (c) 0.219 (d) 21.9
  38. 38.7.5 × 1.1 — where does the decimal point go? (a) 0.825 (b) 82.5 (c) 0.0825 (d) 8.25
  39. 39.0.72 × 19 — where does the decimal point go? (a) 1.368 (b) 13.68 (c) 136.8 (d) 0.1368
  40. 40.0.59 × 3.5 — where does the decimal point go? (a) 0.02065 (b) 2.065 (c) 0.2065 (d) 20.65

Answer key

  1. 34.5
  2. 1.95
  3. 1.05
  4. 9.66
  5. 0.72
  6. 12.71
  7. 0.165
  8. 382.2
  9. 294.8
  10. 36.49
  11. 1.394
  12. 2.288
  13. 3.32
  14. 172.2
  15. 1.716
  16. 0.69
  17. 0.36
  18. 1.38
  19. 91.2
  20. 163.8
  21. 2.233
  22. 11.7
  23. 0.96
  24. 1.98
  25. 20.8
  26. 1.08
  27. 1.56
  28. 22.62
  29. 38.4
  30. 10.8
  31. 2.61
  32. 1.22
  33. 2.72
  34. 1.54
  35. 6.27
  36. 0.304
  37. 2.19
  38. 8.25
  39. 13.68
  40. 2.065

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