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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 159 · 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. 1.7.1 × 19 — where does the decimal point go? (a) 13.49 (b) 134.9 (c) 1349 (d) 1.349
  2. 2.3.3 × 29 — where does the decimal point go? (a) 9.57 (b) 0.957 (c) 95.7 (d) 957
  3. 3.1.8 × 17 — where does the decimal point go? (a) 30.6 (b) 0.306 (c) 306 (d) 3.06
  4. 4.3.6 × 4.8 — where does the decimal point go? (a) 17.28 (b) 0.1728 (c) 1.728 (d) 172.8
  5. 5.0.21 × 0.7 — where does the decimal point go? (a) 0.0147 (b) 1.47 (c) 0.00147 (d) 0.147
  6. 6.1.5 × 4.9 — where does the decimal point go? (a) 0.735 (b) 0.0735 (c) 73.5 (d) 7.35
  7. 7.7.6 × 46 — where does the decimal point go? (a) 349.6 (b) 3.496 (c) 34.96 (d) 3496
  8. 8.8.4 × 0.7 — where does the decimal point go? (a) 0.0588 (b) 0.588 (c) 58.8 (d) 5.88
  9. 9.1.8 × 37 — where does the decimal point go? (a) 0.666 (b) 66.6 (c) 6.66 (d) 666
  10. 10.0.86 × 29 — where does the decimal point go? (a) 249.4 (b) 0.2494 (c) 24.94 (d) 2.494
  11. 11.0.88 × 8 — where does the decimal point go? (a) 0.704 (b) 7.04 (c) 0.0704 (d) 70.4
  12. 12.0.77 × 7 — where does the decimal point go? (a) 0.0539 (b) 53.9 (c) 5.39 (d) 0.539
  13. 13.6.1 × 45 — where does the decimal point go? (a) 27.45 (b) 2.745 (c) 274.5 (d) 2745
  14. 14.2.8 × 9 — where does the decimal point go? (a) 25.2 (b) 0.252 (c) 252 (d) 2.52
  15. 15.7.8 × 21 — where does the decimal point go? (a) 1.638 (b) 16.38 (c) 1638 (d) 163.8
  16. 16.0.57 × 0.2 — where does the decimal point go? (a) 1.14 (b) 0.114 (c) 0.0114 (d) 0.00114
  17. 17.0.33 × 0.5 — where does the decimal point go? (a) 1.65 (b) 0.0165 (c) 0.165 (d) 0.00165
  18. 18.0.26 × 9 — where does the decimal point go? (a) 23.4 (b) 2.34 (c) 0.234 (d) 0.0234
  19. 19.2.2 × 7 — where does the decimal point go? (a) 154 (b) 1.54 (c) 15.4 (d) 0.154
  20. 20.2.2 × 19 — where does the decimal point go? (a) 0.418 (b) 418 (c) 41.8 (d) 4.18
  21. 21.0.84 × 8 — where does the decimal point go? (a) 0.672 (b) 67.2 (c) 6.72 (d) 0.0672
  22. 22.0.53 × 3.7 — where does the decimal point go? (a) 19.61 (b) 0.1961 (c) 1.961 (d) 0.01961
  23. 23.0.87 × 0.2 — where does the decimal point go? (a) 1.74 (b) 0.174 (c) 0.0174 (d) 0.00174
  24. 24.4.2 × 0.6 — where does the decimal point go? (a) 0.0252 (b) 0.252 (c) 25.2 (d) 2.52
  25. 25.4.7 × 19 — where does the decimal point go? (a) 893 (b) 8.93 (c) 0.893 (d) 89.3
  26. 26.0.41 × 0.3 — where does the decimal point go? (a) 0.0123 (b) 1.23 (c) 0.123 (d) 0.00123
  27. 27.7.1 × 2 — where does the decimal point go? (a) 1.42 (b) 14.2 (c) 0.142 (d) 142
  28. 28.7.8 × 3.9 — where does the decimal point go? (a) 3.042 (b) 30.42 (c) 304.2 (d) 0.3042
  29. 29.9.1 × 27 — where does the decimal point go? (a) 2.457 (b) 24.57 (c) 2457 (d) 245.7
  30. 30.0.44 × 4 — where does the decimal point go? (a) 1.76 (b) 17.6 (c) 0.176 (d) 0.0176
  31. 31.0.82 × 8 — where does the decimal point go? (a) 6.56 (b) 0.0656 (c) 0.656 (d) 65.6
  32. 32.0.53 × 46 — where does the decimal point go? (a) 243.8 (b) 2.438 (c) 0.2438 (d) 24.38
  33. 33.0.41 × 0.7 — where does the decimal point go? (a) 0.00287 (b) 0.287 (c) 0.0287 (d) 2.87
  34. 34.0.41 × 2 — where does the decimal point go? (a) 8.2 (b) 0.082 (c) 0.82 (d) 0.0082
  35. 35.7.1 × 1.8 — where does the decimal point go? (a) 12.78 (b) 1.278 (c) 0.1278 (d) 127.8
  36. 36.0.24 × 14 — where does the decimal point go? (a) 3.36 (b) 33.6 (c) 0.336 (d) 0.0336
  37. 37.1.7 × 2 — where does the decimal point go? (a) 34 (b) 0.034 (c) 3.4 (d) 0.34
  38. 38.0.25 × 3 — where does the decimal point go? (a) 0.075 (b) 0.0075 (c) 7.5 (d) 0.75
  39. 39.2.3 × 9 — where does the decimal point go? (a) 2.07 (b) 20.7 (c) 0.207 (d) 207
  40. 40.0.75 × 35 — where does the decimal point go? (a) 0.2625 (b) 26.25 (c) 262.5 (d) 2.625

Answer key

  1. 134.9
  2. 95.7
  3. 30.6
  4. 17.28
  5. 0.147
  6. 7.35
  7. 349.6
  8. 5.88
  9. 66.6
  10. 24.94
  11. 7.04
  12. 5.39
  13. 274.5
  14. 25.2
  15. 163.8
  16. 0.114
  17. 0.165
  18. 2.34
  19. 15.4
  20. 41.8
  21. 6.72
  22. 1.961
  23. 0.174
  24. 2.52
  25. 89.3
  26. 0.123
  27. 14.2
  28. 30.42
  29. 245.7
  30. 1.76
  31. 6.56
  32. 24.38
  33. 0.287
  34. 0.82
  35. 12.78
  36. 3.36
  37. 3.4
  38. 0.75
  39. 20.7
  40. 26.25

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