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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 486 · 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. 1.0.38 × 0.2 — where does the decimal point go? (a) 0.76 (b) 0.0076 (c) 0.076 (d) 0.00076
  2. 2.4.6 × 4.9 — where does the decimal point go? (a) 2.254 (b) 225.4 (c) 0.2254 (d) 22.54
  3. 3.0.16 × 4 — where does the decimal point go? (a) 0.64 (b) 0.0064 (c) 6.4 (d) 0.064
  4. 4.7.7 × 18 — where does the decimal point go? (a) 13.86 (b) 1386 (c) 1.386 (d) 138.6
  5. 5.1.7 × 0.5 — where does the decimal point go? (a) 0.085 (b) 0.0085 (c) 8.5 (d) 0.85
  6. 6.0.45 × 23 — where does the decimal point go? (a) 0.1035 (b) 103.5 (c) 10.35 (d) 1.035
  7. 7.0.31 × 28 — where does the decimal point go? (a) 86.8 (b) 0.868 (c) 0.0868 (d) 8.68
  8. 8.0.18 × 4.8 — where does the decimal point go? (a) 0.864 (b) 0.00864 (c) 8.64 (d) 0.0864
  9. 9.2.2 × 8 — where does the decimal point go? (a) 1.76 (b) 176 (c) 17.6 (d) 0.176
  10. 10.0.36 × 0.2 — where does the decimal point go? (a) 0.00072 (b) 0.072 (c) 0.0072 (d) 0.72
  11. 11.7.9 × 18 — where does the decimal point go? (a) 142.2 (b) 14.22 (c) 1.422 (d) 1422
  12. 12.0.49 × 0.6 — where does the decimal point go? (a) 2.94 (b) 0.00294 (c) 0.0294 (d) 0.294
  13. 13.0.61 × 45 — where does the decimal point go? (a) 274.5 (b) 2.745 (c) 27.45 (d) 0.2745
  14. 14.7.2 × 1.4 — where does the decimal point go? (a) 1.008 (b) 10.08 (c) 100.8 (d) 0.1008
  15. 15.1.3 × 3.9 — where does the decimal point go? (a) 5.07 (b) 0.507 (c) 0.0507 (d) 50.7
  16. 16.9.7 × 11 — where does the decimal point go? (a) 106.7 (b) 1067 (c) 1.067 (d) 10.67
  17. 17.3.3 × 32 — where does the decimal point go? (a) 1056 (b) 10.56 (c) 1.056 (d) 105.6
  18. 18.8.3 × 0.3 — where does the decimal point go? (a) 0.0249 (b) 0.249 (c) 2.49 (d) 24.9
  19. 19.0.19 × 0.7 — where does the decimal point go? (a) 0.0133 (b) 1.33 (c) 0.133 (d) 0.00133
  20. 20.0.17 × 43 — where does the decimal point go? (a) 73.1 (b) 0.0731 (c) 0.731 (d) 7.31
  21. 21.0.77 × 3.7 — where does the decimal point go? (a) 0.02849 (b) 28.49 (c) 2.849 (d) 0.2849
  22. 22.7.8 × 1.6 — where does the decimal point go? (a) 1.248 (b) 12.48 (c) 124.8 (d) 0.1248
  23. 23.9.8 × 6 — where does the decimal point go? (a) 0.588 (b) 5.88 (c) 588 (d) 58.8
  24. 24.8.6 × 2.8 — where does the decimal point go? (a) 240.8 (b) 24.08 (c) 2.408 (d) 0.2408
  25. 25.4.5 × 0.5 — where does the decimal point go? (a) 0.0225 (b) 22.5 (c) 0.225 (d) 2.25
  26. 26.0.16 × 0.8 — where does the decimal point go? (a) 0.128 (b) 0.0128 (c) 1.28 (d) 0.00128
  27. 27.6.2 × 0.4 — where does the decimal point go? (a) 0.248 (b) 24.8 (c) 0.0248 (d) 2.48
  28. 28.3.9 × 3.8 — where does the decimal point go? (a) 0.1482 (b) 14.82 (c) 148.2 (d) 1.482
  29. 29.5.1 × 41 — where does the decimal point go? (a) 2.091 (b) 2091 (c) 209.1 (d) 20.91
  30. 30.9.7 × 3 — where does the decimal point go? (a) 0.291 (b) 2.91 (c) 291 (d) 29.1
  31. 31.9.2 × 0.9 — where does the decimal point go? (a) 0.828 (b) 0.0828 (c) 8.28 (d) 82.8
  32. 32.0.46 × 7 — where does the decimal point go? (a) 3.22 (b) 0.0322 (c) 0.322 (d) 32.2
  33. 33.0.32 × 2 — where does the decimal point go? (a) 0.064 (b) 0.64 (c) 6.4 (d) 0.0064
  34. 34.9.7 × 0.2 — where does the decimal point go? (a) 19.4 (b) 1.94 (c) 0.194 (d) 0.0194
  35. 35.0.38 × 31 — where does the decimal point go? (a) 0.1178 (b) 1.178 (c) 11.78 (d) 117.8
  36. 36.0.45 × 3.5 — where does the decimal point go? (a) 15.75 (b) 0.01575 (c) 0.1575 (d) 1.575
  37. 37.0.77 × 8 — where does the decimal point go? (a) 0.616 (b) 61.6 (c) 6.16 (d) 0.0616
  38. 38.0.71 × 3 — where does the decimal point go? (a) 0.213 (b) 21.3 (c) 0.0213 (d) 2.13
  39. 39.3.9 × 39 — where does the decimal point go? (a) 1521 (b) 15.21 (c) 152.1 (d) 1.521
  40. 40.0.74 × 2 — where does the decimal point go? (a) 1.48 (b) 14.8 (c) 0.0148 (d) 0.148

Answer key

  1. 0.076
  2. 22.54
  3. 0.64
  4. 138.6
  5. 0.85
  6. 10.35
  7. 8.68
  8. 0.864
  9. 17.6
  10. 0.072
  11. 142.2
  12. 0.294
  13. 27.45
  14. 10.08
  15. 5.07
  16. 106.7
  17. 105.6
  18. 2.49
  19. 0.133
  20. 7.31
  21. 2.849
  22. 12.48
  23. 58.8
  24. 24.08
  25. 2.25
  26. 0.128
  27. 2.48
  28. 14.82
  29. 209.1
  30. 29.1
  31. 8.28
  32. 3.22
  33. 0.64
  34. 1.94
  35. 11.78
  36. 1.575
  37. 6.16
  38. 2.13
  39. 152.1
  40. 1.48

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