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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 508 · 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. 1.9.9 × 0.4 — where does the decimal point go? (a) 3.96 (b) 39.6 (c) 0.0396 (d) 0.396
  2. 2.0.87 × 0.7 — where does the decimal point go? (a) 0.00609 (b) 6.09 (c) 0.609 (d) 0.0609
  3. 3.3.8 × 0.2 — where does the decimal point go? (a) 0.076 (b) 0.76 (c) 0.0076 (d) 7.6
  4. 4.0.14 × 27 — where does the decimal point go? (a) 37.8 (b) 0.0378 (c) 0.378 (d) 3.78
  5. 5.0.87 × 1.1 — where does the decimal point go? (a) 0.957 (b) 0.0957 (c) 0.00957 (d) 9.57
  6. 6.7.8 × 0.8 — where does the decimal point go? (a) 6.24 (b) 62.4 (c) 0.0624 (d) 0.624
  7. 7.0.38 × 0.4 — where does the decimal point go? (a) 0.152 (b) 0.0152 (c) 1.52 (d) 0.00152
  8. 8.0.91 × 41 — where does the decimal point go? (a) 0.3731 (b) 3.731 (c) 37.31 (d) 373.1
  9. 9.0.64 × 6 — where does the decimal point go? (a) 3.84 (b) 0.0384 (c) 0.384 (d) 38.4
  10. 10.1.5 × 1.1 — where does the decimal point go? (a) 0.165 (b) 0.0165 (c) 1.65 (d) 16.5
  11. 11.6.3 × 5 — where does the decimal point go? (a) 3.15 (b) 0.315 (c) 31.5 (d) 315
  12. 12.0.43 × 8 — where does the decimal point go? (a) 3.44 (b) 34.4 (c) 0.0344 (d) 0.344
  13. 13.1.6 × 3.1 — where does the decimal point go? (a) 4.96 (b) 0.496 (c) 49.6 (d) 0.0496
  14. 14.9.9 × 1.5 — where does the decimal point go? (a) 1.485 (b) 14.85 (c) 148.5 (d) 0.1485
  15. 15.1.9 × 1.8 — where does the decimal point go? (a) 3.42 (b) 0.0342 (c) 34.2 (d) 0.342
  16. 16.9.1 × 25 — where does the decimal point go? (a) 2275 (b) 227.5 (c) 2.275 (d) 22.75
  17. 17.4.2 × 0.4 — where does the decimal point go? (a) 16.8 (b) 0.168 (c) 1.68 (d) 0.0168
  18. 18.2.6 × 46 — where does the decimal point go? (a) 119.6 (b) 11.96 (c) 1.196 (d) 1196
  19. 19.0.43 × 45 — where does the decimal point go? (a) 19.35 (b) 0.1935 (c) 193.5 (d) 1.935
  20. 20.0.41 × 35 — where does the decimal point go? (a) 0.1435 (b) 1.435 (c) 143.5 (d) 14.35
  21. 21.0.88 × 33 — where does the decimal point go? (a) 29.04 (b) 2.904 (c) 290.4 (d) 0.2904
  22. 22.2.4 × 2 — where does the decimal point go? (a) 0.48 (b) 4.8 (c) 0.048 (d) 48
  23. 23.0.12 × 46 — where does the decimal point go? (a) 0.0552 (b) 55.2 (c) 0.552 (d) 5.52
  24. 24.3.2 × 0.7 — where does the decimal point go? (a) 0.0224 (b) 2.24 (c) 0.224 (d) 22.4
  25. 25.0.73 × 1.4 — where does the decimal point go? (a) 0.01022 (b) 1.022 (c) 0.1022 (d) 10.22
  26. 26.6.2 × 3 — where does the decimal point go? (a) 18.6 (b) 1.86 (c) 0.186 (d) 186
  27. 27.6.1 × 7 — where does the decimal point go? (a) 0.427 (b) 427 (c) 4.27 (d) 42.7
  28. 28.0.35 × 9 — where does the decimal point go? (a) 0.315 (b) 0.0315 (c) 3.15 (d) 31.5
  29. 29.0.32 × 7 — where does the decimal point go? (a) 22.4 (b) 0.0224 (c) 0.224 (d) 2.24
  30. 30.1.9 × 3.4 — where does the decimal point go? (a) 0.0646 (b) 64.6 (c) 0.646 (d) 6.46
  31. 31.0.94 × 3.1 — where does the decimal point go? (a) 0.2914 (b) 2.914 (c) 0.02914 (d) 29.14
  32. 32.2.6 × 4.1 — where does the decimal point go? (a) 106.6 (b) 10.66 (c) 1.066 (d) 0.1066
  33. 33.7.9 × 0.2 — where does the decimal point go? (a) 0.158 (b) 0.0158 (c) 1.58 (d) 15.8
  34. 34.9.8 × 1.1 — where does the decimal point go? (a) 1.078 (b) 10.78 (c) 107.8 (d) 0.1078
  35. 35.2.2 × 39 — where does the decimal point go? (a) 0.858 (b) 85.8 (c) 858 (d) 8.58
  36. 36.0.89 × 13 — where does the decimal point go? (a) 11.57 (b) 0.1157 (c) 115.7 (d) 1.157
  37. 37.3.1 × 0.8 — where does the decimal point go? (a) 2.48 (b) 0.248 (c) 24.8 (d) 0.0248
  38. 38.0.32 × 1.2 — where does the decimal point go? (a) 0.384 (b) 0.0384 (c) 0.00384 (d) 3.84
  39. 39.0.31 × 5 — where does the decimal point go? (a) 0.0155 (b) 1.55 (c) 15.5 (d) 0.155
  40. 40.0.69 × 0.5 — where does the decimal point go? (a) 0.0345 (b) 0.00345 (c) 0.345 (d) 3.45

Answer key

  1. 3.96
  2. 0.609
  3. 0.76
  4. 3.78
  5. 0.957
  6. 6.24
  7. 0.152
  8. 37.31
  9. 3.84
  10. 1.65
  11. 31.5
  12. 3.44
  13. 4.96
  14. 14.85
  15. 3.42
  16. 227.5
  17. 1.68
  18. 119.6
  19. 19.35
  20. 14.35
  21. 29.04
  22. 4.8
  23. 5.52
  24. 2.24
  25. 1.022
  26. 18.6
  27. 42.7
  28. 3.15
  29. 2.24
  30. 6.46
  31. 2.914
  32. 10.66
  33. 1.58
  34. 10.78
  35. 85.8
  36. 11.57
  37. 2.48
  38. 0.384
  39. 1.55
  40. 0.345

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