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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 40 · 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. 1.0.17 × 9 — where does the decimal point go? (a) 0.153 (b) 1.53 (c) 0.0153 (d) 15.3
  2. 2.0.33 × 1.2 — where does the decimal point go? (a) 0.396 (b) 0.00396 (c) 0.0396 (d) 3.96
  3. 3.6.5 × 31 — where does the decimal point go? (a) 2015 (b) 20.15 (c) 201.5 (d) 2.015
  4. 4.6.7 × 2.5 — where does the decimal point go? (a) 1.675 (b) 0.1675 (c) 167.5 (d) 16.75
  5. 5.0.31 × 9 — where does the decimal point go? (a) 2.79 (b) 0.0279 (c) 27.9 (d) 0.279
  6. 6.2.9 × 5 — where does the decimal point go? (a) 145 (b) 1.45 (c) 14.5 (d) 0.145
  7. 7.8.3 × 0.4 — where does the decimal point go? (a) 33.2 (b) 3.32 (c) 0.332 (d) 0.0332
  8. 8.4.3 × 2 — where does the decimal point go? (a) 86 (b) 0.086 (c) 8.6 (d) 0.86
  9. 9.1.4 × 0.6 — where does the decimal point go? (a) 0.084 (b) 8.4 (c) 0.0084 (d) 0.84
  10. 10.0.75 × 2.1 — where does the decimal point go? (a) 0.1575 (b) 0.01575 (c) 1.575 (d) 15.75
  11. 11.0.98 × 3.1 — where does the decimal point go? (a) 0.03038 (b) 3.038 (c) 30.38 (d) 0.3038
  12. 12.2.6 × 4.6 — where does the decimal point go? (a) 119.6 (b) 11.96 (c) 0.1196 (d) 1.196
  13. 13.8.9 × 0.2 — where does the decimal point go? (a) 0.0178 (b) 0.178 (c) 17.8 (d) 1.78
  14. 14.0.67 × 2.3 — where does the decimal point go? (a) 0.01541 (b) 1.541 (c) 0.1541 (d) 15.41
  15. 15.0.47 × 0.6 — where does the decimal point go? (a) 0.282 (b) 0.00282 (c) 2.82 (d) 0.0282
  16. 16.4.9 × 8 — where does the decimal point go? (a) 3.92 (b) 0.392 (c) 392 (d) 39.2
  17. 17.9.7 × 33 — where does the decimal point go? (a) 320.1 (b) 3201 (c) 3.201 (d) 32.01
  18. 18.2.5 × 0.5 — where does the decimal point go? (a) 12.5 (b) 0.0125 (c) 1.25 (d) 0.125
  19. 19.0.95 × 21 — where does the decimal point go? (a) 199.5 (b) 19.95 (c) 1.995 (d) 0.1995
  20. 20.8.9 × 15 — where does the decimal point go? (a) 13.35 (b) 133.5 (c) 1335 (d) 1.335
  21. 21.0.49 × 4.5 — where does the decimal point go? (a) 0.02205 (b) 22.05 (c) 0.2205 (d) 2.205
  22. 22.2.6 × 2 — where does the decimal point go? (a) 0.052 (b) 0.52 (c) 52 (d) 5.2
  23. 23.0.79 × 2.7 — where does the decimal point go? (a) 0.2133 (b) 21.33 (c) 2.133 (d) 0.02133
  24. 24.7.6 × 0.8 — where does the decimal point go? (a) 0.0608 (b) 0.608 (c) 60.8 (d) 6.08
  25. 25.0.46 × 0.3 — where does the decimal point go? (a) 0.00138 (b) 1.38 (c) 0.138 (d) 0.0138
  26. 26.7.7 × 19 — where does the decimal point go? (a) 14.63 (b) 146.3 (c) 1.463 (d) 1463
  27. 27.0.85 × 37 — where does the decimal point go? (a) 3.145 (b) 314.5 (c) 31.45 (d) 0.3145
  28. 28.2.7 × 3 — where does the decimal point go? (a) 81 (b) 0.81 (c) 0.081 (d) 8.1
  29. 29.8.9 × 26 — where does the decimal point go? (a) 2314 (b) 2.314 (c) 231.4 (d) 23.14
  30. 30.3.2 × 0.7 — where does the decimal point go? (a) 0.0224 (b) 0.224 (c) 22.4 (d) 2.24
  31. 31.9.9 × 4 — where does the decimal point go? (a) 396 (b) 3.96 (c) 0.396 (d) 39.6
  32. 32.0.48 × 2 — where does the decimal point go? (a) 9.6 (b) 0.096 (c) 0.0096 (d) 0.96
  33. 33.9.8 × 38 — where does the decimal point go? (a) 3.724 (b) 372.4 (c) 3724 (d) 37.24
  34. 34.0.84 × 33 — where does the decimal point go? (a) 0.2772 (b) 27.72 (c) 2.772 (d) 277.2
  35. 35.0.79 × 3 — where does the decimal point go? (a) 0.237 (b) 0.0237 (c) 23.7 (d) 2.37
  36. 36.0.42 × 17 — where does the decimal point go? (a) 71.4 (b) 0.714 (c) 0.0714 (d) 7.14
  37. 37.0.82 × 0.7 — where does the decimal point go? (a) 0.574 (b) 5.74 (c) 0.0574 (d) 0.00574
  38. 38.9.2 × 8 — where does the decimal point go? (a) 0.736 (b) 73.6 (c) 736 (d) 7.36
  39. 39.0.18 × 19 — where does the decimal point go? (a) 34.2 (b) 0.342 (c) 3.42 (d) 0.0342
  40. 40.0.86 × 6 — where does the decimal point go? (a) 0.516 (b) 5.16 (c) 0.0516 (d) 51.6

Answer key

  1. 1.53
  2. 0.396
  3. 201.5
  4. 16.75
  5. 2.79
  6. 14.5
  7. 3.32
  8. 8.6
  9. 0.84
  10. 1.575
  11. 3.038
  12. 11.96
  13. 1.78
  14. 1.541
  15. 0.282
  16. 39.2
  17. 320.1
  18. 1.25
  19. 19.95
  20. 133.5
  21. 2.205
  22. 5.2
  23. 2.133
  24. 6.08
  25. 0.138
  26. 146.3
  27. 31.45
  28. 8.1
  29. 231.4
  30. 2.24
  31. 39.6
  32. 0.96
  33. 372.4
  34. 27.72
  35. 2.37
  36. 7.14
  37. 0.574
  38. 73.6
  39. 3.42
  40. 5.16

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