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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 150 · 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. 1.4.2 × 6 — where does the decimal point go? (a) 25.2 (b) 0.252 (c) 2.52 (d) 252
  2. 2.2.1 × 2 — where does the decimal point go? (a) 0.42 (b) 4.2 (c) 42 (d) 0.042
  3. 3.6.9 × 19 — where does the decimal point go? (a) 131.1 (b) 1311 (c) 1.311 (d) 13.11
  4. 4.9.5 × 11 — where does the decimal point go? (a) 104.5 (b) 1.045 (c) 10.45 (d) 1045
  5. 5.6.3 × 2 — where does the decimal point go? (a) 0.126 (b) 12.6 (c) 1.26 (d) 126
  6. 6.7.7 × 41 — where does the decimal point go? (a) 3.157 (b) 3157 (c) 31.57 (d) 315.7
  7. 7.0.31 × 3 — where does the decimal point go? (a) 9.3 (b) 0.0093 (c) 0.093 (d) 0.93
  8. 8.0.75 × 1.1 — where does the decimal point go? (a) 0.825 (b) 0.0825 (c) 0.00825 (d) 8.25
  9. 9.0.55 × 3 — where does the decimal point go? (a) 0.165 (b) 1.65 (c) 0.0165 (d) 16.5
  10. 10.3.3 × 11 — where does the decimal point go? (a) 363 (b) 0.363 (c) 3.63 (d) 36.3
  11. 11.3.5 × 9 — where does the decimal point go? (a) 315 (b) 0.315 (c) 3.15 (d) 31.5
  12. 12.5.3 × 2.6 — where does the decimal point go? (a) 137.8 (b) 1.378 (c) 13.78 (d) 0.1378
  13. 13.8.3 × 2.5 — where does the decimal point go? (a) 0.2075 (b) 207.5 (c) 2.075 (d) 20.75
  14. 14.2.5 × 5 — where does the decimal point go? (a) 125 (b) 0.125 (c) 12.5 (d) 1.25
  15. 15.0.33 × 16 — where does the decimal point go? (a) 5.28 (b) 0.0528 (c) 52.8 (d) 0.528
  16. 16.0.19 × 1.1 — where does the decimal point go? (a) 0.00209 (b) 0.0209 (c) 0.209 (d) 2.09
  17. 17.8.3 × 2 — where does the decimal point go? (a) 166 (b) 0.166 (c) 1.66 (d) 16.6
  18. 18.9.9 × 38 — where does the decimal point go? (a) 376.2 (b) 37.62 (c) 3762 (d) 3.762
  19. 19.0.36 × 1.4 — where does the decimal point go? (a) 5.04 (b) 0.504 (c) 0.0504 (d) 0.00504
  20. 20.0.33 × 9 — where does the decimal point go? (a) 29.7 (b) 0.297 (c) 0.0297 (d) 2.97
  21. 21.0.66 × 3.7 — where does the decimal point go? (a) 0.02442 (b) 24.42 (c) 2.442 (d) 0.2442
  22. 22.9.4 × 0.7 — where does the decimal point go? (a) 0.658 (b) 0.0658 (c) 6.58 (d) 65.8
  23. 23.0.89 × 0.3 — where does the decimal point go? (a) 0.267 (b) 0.00267 (c) 0.0267 (d) 2.67
  24. 24.2.8 × 14 — where does the decimal point go? (a) 392 (b) 0.392 (c) 3.92 (d) 39.2
  25. 25.0.88 × 1.8 — where does the decimal point go? (a) 0.1584 (b) 0.01584 (c) 1.584 (d) 15.84
  26. 26.3.4 × 23 — where does the decimal point go? (a) 0.782 (b) 78.2 (c) 7.82 (d) 782
  27. 27.5.5 × 29 — where does the decimal point go? (a) 15.95 (b) 159.5 (c) 1.595 (d) 1595
  28. 28.0.35 × 45 — where does the decimal point go? (a) 1.575 (b) 15.75 (c) 0.1575 (d) 157.5
  29. 29.0.54 × 26 — where does the decimal point go? (a) 140.4 (b) 14.04 (c) 1.404 (d) 0.1404
  30. 30.0.91 × 48 — where does the decimal point go? (a) 43.68 (b) 436.8 (c) 0.4368 (d) 4.368
  31. 31.0.97 × 2.2 — where does the decimal point go? (a) 0.2134 (b) 0.02134 (c) 21.34 (d) 2.134
  32. 32.1.4 × 4.1 — where does the decimal point go? (a) 5.74 (b) 0.574 (c) 0.0574 (d) 57.4
  33. 33.9.7 × 28 — where does the decimal point go? (a) 271.6 (b) 2.716 (c) 27.16 (d) 2716
  34. 34.6.7 × 12 — where does the decimal point go? (a) 0.804 (b) 80.4 (c) 804 (d) 8.04
  35. 35.0.33 × 5 — where does the decimal point go? (a) 16.5 (b) 0.0165 (c) 1.65 (d) 0.165
  36. 36.0.79 × 0.5 — where does the decimal point go? (a) 0.0395 (b) 3.95 (c) 0.395 (d) 0.00395
  37. 37.2.4 × 21 — where does the decimal point go? (a) 50.4 (b) 0.504 (c) 5.04 (d) 504
  38. 38.0.93 × 11 — where does the decimal point go? (a) 10.23 (b) 1.023 (c) 102.3 (d) 0.1023
  39. 39.0.37 × 0.9 — where does the decimal point go? (a) 0.333 (b) 0.0333 (c) 0.00333 (d) 3.33
  40. 40.5.1 × 0.2 — where does the decimal point go? (a) 10.2 (b) 0.102 (c) 1.02 (d) 0.0102

Answer key

  1. 25.2
  2. 4.2
  3. 131.1
  4. 104.5
  5. 12.6
  6. 315.7
  7. 0.93
  8. 0.825
  9. 1.65
  10. 36.3
  11. 31.5
  12. 13.78
  13. 20.75
  14. 12.5
  15. 5.28
  16. 0.209
  17. 16.6
  18. 376.2
  19. 0.504
  20. 2.97
  21. 2.442
  22. 6.58
  23. 0.267
  24. 39.2
  25. 1.584
  26. 78.2
  27. 159.5
  28. 15.75
  29. 14.04
  30. 43.68
  31. 2.134
  32. 5.74
  33. 271.6
  34. 80.4
  35. 1.65
  36. 0.395
  37. 50.4
  38. 10.23
  39. 0.333
  40. 1.02

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