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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 570 · 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. 1.9.7 × 13 — where does the decimal point go? (a) 12.61 (b) 1.261 (c) 126.1 (d) 1261
  2. 2.7.5 × 0.5 — where does the decimal point go? (a) 0.375 (b) 37.5 (c) 3.75 (d) 0.0375
  3. 3.0.23 × 0.2 — where does the decimal point go? (a) 0.0046 (b) 0.046 (c) 0.46 (d) 0.00046
  4. 4.0.84 × 1.1 — where does the decimal point go? (a) 0.924 (b) 0.0924 (c) 0.00924 (d) 9.24
  5. 5.8.1 × 2 — where does the decimal point go? (a) 16.2 (b) 1.62 (c) 0.162 (d) 162
  6. 6.3.8 × 0.8 — where does the decimal point go? (a) 3.04 (b) 0.0304 (c) 30.4 (d) 0.304
  7. 7.5.5 × 2.5 — where does the decimal point go? (a) 137.5 (b) 0.1375 (c) 1.375 (d) 13.75
  8. 8.0.19 × 21 — where does the decimal point go? (a) 0.399 (b) 3.99 (c) 0.0399 (d) 39.9
  9. 9.7.1 × 12 — where does the decimal point go? (a) 8.52 (b) 85.2 (c) 0.852 (d) 852
  10. 10.2.3 × 4.1 — where does the decimal point go? (a) 9.43 (b) 0.0943 (c) 0.943 (d) 94.3
  11. 11.0.84 × 0.2 — where does the decimal point go? (a) 0.168 (b) 1.68 (c) 0.00168 (d) 0.0168
  12. 12.0.66 × 4 — where does the decimal point go? (a) 0.0264 (b) 2.64 (c) 0.264 (d) 26.4
  13. 13.0.89 × 4.8 — where does the decimal point go? (a) 0.4272 (b) 42.72 (c) 0.04272 (d) 4.272
  14. 14.0.58 × 2.1 — where does the decimal point go? (a) 0.1218 (b) 1.218 (c) 0.01218 (d) 12.18
  15. 15.8.1 × 3.7 — where does the decimal point go? (a) 29.97 (b) 0.2997 (c) 299.7 (d) 2.997
  16. 16.0.95 × 39 — where does the decimal point go? (a) 37.05 (b) 370.5 (c) 0.3705 (d) 3.705
  17. 17.0.34 × 0.3 — where does the decimal point go? (a) 0.0102 (b) 1.02 (c) 0.00102 (d) 0.102
  18. 18.6.5 × 0.9 — where does the decimal point go? (a) 5.85 (b) 0.0585 (c) 58.5 (d) 0.585
  19. 19.7.6 × 1.1 — where does the decimal point go? (a) 0.0836 (b) 0.836 (c) 83.6 (d) 8.36
  20. 20.0.32 × 36 — where does the decimal point go? (a) 11.52 (b) 115.2 (c) 0.1152 (d) 1.152
  21. 21.0.87 × 0.4 — where does the decimal point go? (a) 3.48 (b) 0.0348 (c) 0.00348 (d) 0.348
  22. 22.9.7 × 0.4 — where does the decimal point go? (a) 38.8 (b) 0.0388 (c) 0.388 (d) 3.88
  23. 23.5.6 × 1.1 — where does the decimal point go? (a) 0.0616 (b) 61.6 (c) 0.616 (d) 6.16
  24. 24.0.91 × 2.2 — where does the decimal point go? (a) 2.002 (b) 0.2002 (c) 0.02002 (d) 20.02
  25. 25.0.73 × 31 — where does the decimal point go? (a) 2.263 (b) 226.3 (c) 0.2263 (d) 22.63
  26. 26.0.25 × 3.9 — where does the decimal point go? (a) 0.0975 (b) 0.975 (c) 9.75 (d) 0.00975
  27. 27.0.36 × 7 — where does the decimal point go? (a) 2.52 (b) 0.0252 (c) 25.2 (d) 0.252
  28. 28.9.1 × 3 — where does the decimal point go? (a) 2.73 (b) 273 (c) 0.273 (d) 27.3
  29. 29.1.6 × 4 — where does the decimal point go? (a) 0.64 (b) 6.4 (c) 0.064 (d) 64
  30. 30.2.7 × 1.3 — where does the decimal point go? (a) 3.51 (b) 35.1 (c) 0.0351 (d) 0.351
  31. 31.7.5 × 3 — where does the decimal point go? (a) 22.5 (b) 2.25 (c) 0.225 (d) 225
  32. 32.0.69 × 47 — where does the decimal point go? (a) 32.43 (b) 324.3 (c) 3.243 (d) 0.3243
  33. 33.0.41 × 0.8 — where does the decimal point go? (a) 0.00328 (b) 0.328 (c) 0.0328 (d) 3.28
  34. 34.3.3 × 0.5 — where does the decimal point go? (a) 0.165 (b) 16.5 (c) 1.65 (d) 0.0165
  35. 35.0.72 × 11 — where does the decimal point go? (a) 0.792 (b) 0.0792 (c) 7.92 (d) 79.2
  36. 36.7.3 × 47 — where does the decimal point go? (a) 343.1 (b) 3.431 (c) 3431 (d) 34.31
  37. 37.0.35 × 9 — where does the decimal point go? (a) 31.5 (b) 3.15 (c) 0.315 (d) 0.0315
  38. 38.3.6 × 8 — where does the decimal point go? (a) 28.8 (b) 0.288 (c) 288 (d) 2.88
  39. 39.0.84 × 2 — where does the decimal point go? (a) 0.0168 (b) 0.168 (c) 1.68 (d) 16.8
  40. 40.0.16 × 7 — where does the decimal point go? (a) 0.112 (b) 0.0112 (c) 1.12 (d) 11.2

Answer key

  1. 126.1
  2. 3.75
  3. 0.046
  4. 0.924
  5. 16.2
  6. 3.04
  7. 13.75
  8. 3.99
  9. 85.2
  10. 9.43
  11. 0.168
  12. 2.64
  13. 4.272
  14. 1.218
  15. 29.97
  16. 37.05
  17. 0.102
  18. 5.85
  19. 8.36
  20. 11.52
  21. 0.348
  22. 3.88
  23. 6.16
  24. 2.002
  25. 22.63
  26. 0.975
  27. 2.52
  28. 27.3
  29. 6.4
  30. 3.51
  31. 22.5
  32. 32.43
  33. 0.328
  34. 1.65
  35. 7.92
  36. 343.1
  37. 3.15
  38. 28.8
  39. 1.68
  40. 1.12

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