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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 801 · 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. 1.0.31 × 16 — where does the decimal point go? (a) 0.0496 (b) 49.6 (c) 0.496 (d) 4.96
  2. 2.7.4 × 3.2 — where does the decimal point go? (a) 236.8 (b) 2.368 (c) 0.2368 (d) 23.68
  3. 3.0.13 × 0.3 — where does the decimal point go? (a) 0.039 (b) 0.0039 (c) 0.00039 (d) 0.39
  4. 4.5.2 × 38 — where does the decimal point go? (a) 1976 (b) 19.76 (c) 197.6 (d) 1.976
  5. 5.9.7 × 5 — where does the decimal point go? (a) 48.5 (b) 485 (c) 4.85 (d) 0.485
  6. 6.0.48 × 1.1 — where does the decimal point go? (a) 0.0528 (b) 5.28 (c) 0.00528 (d) 0.528
  7. 7.0.91 × 47 — where does the decimal point go? (a) 427.7 (b) 4.277 (c) 42.77 (d) 0.4277
  8. 8.8.2 × 1.6 — where does the decimal point go? (a) 131.2 (b) 1.312 (c) 0.1312 (d) 13.12
  9. 9.0.95 × 4.7 — where does the decimal point go? (a) 0.4465 (b) 44.65 (c) 0.04465 (d) 4.465
  10. 10.2.3 × 2.7 — where does the decimal point go? (a) 0.0621 (b) 6.21 (c) 0.621 (d) 62.1
  11. 11.2.6 × 0.9 — where does the decimal point go? (a) 23.4 (b) 2.34 (c) 0.0234 (d) 0.234
  12. 12.0.17 × 3.7 — where does the decimal point go? (a) 0.629 (b) 6.29 (c) 0.0629 (d) 0.00629
  13. 13.0.37 × 36 — where does the decimal point go? (a) 1.332 (b) 13.32 (c) 133.2 (d) 0.1332
  14. 14.0.73 × 4.6 — where does the decimal point go? (a) 0.03358 (b) 0.3358 (c) 33.58 (d) 3.358
  15. 15.0.24 × 0.3 — where does the decimal point go? (a) 0.0072 (b) 0.72 (c) 0.00072 (d) 0.072
  16. 16.8.1 × 39 — where does the decimal point go? (a) 3159 (b) 3.159 (c) 31.59 (d) 315.9
  17. 17.3.4 × 13 — where does the decimal point go? (a) 0.442 (b) 442 (c) 4.42 (d) 44.2
  18. 18.3.1 × 2 — where does the decimal point go? (a) 0.62 (b) 62 (c) 6.2 (d) 0.062
  19. 19.2.9 × 37 — where does the decimal point go? (a) 107.3 (b) 10.73 (c) 1073 (d) 1.073
  20. 20.0.62 × 2 — where does the decimal point go? (a) 0.0124 (b) 0.124 (c) 1.24 (d) 12.4
  21. 21.2.9 × 7 — where does the decimal point go? (a) 2.03 (b) 0.203 (c) 20.3 (d) 203
  22. 22.3.6 × 4.4 — where does the decimal point go? (a) 158.4 (b) 1.584 (c) 15.84 (d) 0.1584
  23. 23.0.14 × 0.4 — where does the decimal point go? (a) 0.00056 (b) 0.0056 (c) 0.56 (d) 0.056
  24. 24.0.33 × 2.4 — where does the decimal point go? (a) 0.00792 (b) 0.0792 (c) 0.792 (d) 7.92
  25. 25.0.79 × 0.2 — where does the decimal point go? (a) 0.158 (b) 0.00158 (c) 1.58 (d) 0.0158
  26. 26.9.3 × 19 — where does the decimal point go? (a) 1767 (b) 1.767 (c) 17.67 (d) 176.7
  27. 27.1.3 × 0.4 — where does the decimal point go? (a) 0.052 (b) 0.0052 (c) 5.2 (d) 0.52
  28. 28.0.37 × 0.8 — where does the decimal point go? (a) 0.0296 (b) 2.96 (c) 0.296 (d) 0.00296
  29. 29.1.3 × 3.5 — where does the decimal point go? (a) 0.0455 (b) 4.55 (c) 45.5 (d) 0.455
  30. 30.2.3 × 19 — where does the decimal point go? (a) 437 (b) 43.7 (c) 4.37 (d) 0.437
  31. 31.3.1 × 0.6 — where does the decimal point go? (a) 0.0186 (b) 1.86 (c) 0.186 (d) 18.6
  32. 32.0.39 × 0.2 — where does the decimal point go? (a) 0.78 (b) 0.0078 (c) 0.00078 (d) 0.078
  33. 33.5.4 × 2 — where does the decimal point go? (a) 10.8 (b) 0.108 (c) 108 (d) 1.08
  34. 34.3.7 × 0.3 — where does the decimal point go? (a) 1.11 (b) 11.1 (c) 0.111 (d) 0.0111
  35. 35.5.9 × 0.5 — where does the decimal point go? (a) 2.95 (b) 29.5 (c) 0.295 (d) 0.0295
  36. 36.2.9 × 27 — where does the decimal point go? (a) 783 (b) 7.83 (c) 78.3 (d) 0.783
  37. 37.0.17 × 0.2 — where does the decimal point go? (a) 0.034 (b) 0.34 (c) 0.0034 (d) 0.00034
  38. 38.9.1 × 3.9 — where does the decimal point go? (a) 35.49 (b) 3.549 (c) 0.3549 (d) 354.9
  39. 39.4.7 × 6 — where does the decimal point go? (a) 2.82 (b) 0.282 (c) 28.2 (d) 282
  40. 40.8.8 × 0.2 — where does the decimal point go? (a) 17.6 (b) 1.76 (c) 0.0176 (d) 0.176

Answer key

  1. 4.96
  2. 23.68
  3. 0.039
  4. 197.6
  5. 48.5
  6. 0.528
  7. 42.77
  8. 13.12
  9. 4.465
  10. 6.21
  11. 2.34
  12. 0.629
  13. 13.32
  14. 3.358
  15. 0.072
  16. 315.9
  17. 44.2
  18. 6.2
  19. 107.3
  20. 1.24
  21. 20.3
  22. 15.84
  23. 0.056
  24. 0.792
  25. 0.158
  26. 176.7
  27. 0.52
  28. 0.296
  29. 4.55
  30. 43.7
  31. 1.86
  32. 0.078
  33. 10.8
  34. 1.11
  35. 2.95
  36. 78.3
  37. 0.034
  38. 35.49
  39. 28.2
  40. 1.76

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