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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 881 · 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. 1.4.1 × 2.4 — where does the decimal point go? (a) 0.0984 (b) 0.984 (c) 98.4 (d) 9.84
  2. 2.0.12 × 6 — where does the decimal point go? (a) 0.72 (b) 0.072 (c) 7.2 (d) 0.0072
  3. 3.5.3 × 0.2 — where does the decimal point go? (a) 0.0106 (b) 1.06 (c) 0.106 (d) 10.6
  4. 4.2.5 × 15 — where does the decimal point go? (a) 37.5 (b) 0.375 (c) 3.75 (d) 375
  5. 5.3.4 × 17 — where does the decimal point go? (a) 578 (b) 0.578 (c) 5.78 (d) 57.8
  6. 6.5.9 × 38 — where does the decimal point go? (a) 224.2 (b) 22.42 (c) 2.242 (d) 2242
  7. 7.6.8 × 3.7 — where does the decimal point go? (a) 25.16 (b) 2.516 (c) 251.6 (d) 0.2516
  8. 8.0.36 × 19 — where does the decimal point go? (a) 0.684 (b) 6.84 (c) 0.0684 (d) 68.4
  9. 9.1.6 × 0.4 — where does the decimal point go? (a) 0.64 (b) 0.064 (c) 0.0064 (d) 6.4
  10. 10.6.6 × 8 — where does the decimal point go? (a) 52.8 (b) 528 (c) 0.528 (d) 5.28
  11. 11.0.49 × 4 — where does the decimal point go? (a) 0.196 (b) 19.6 (c) 0.0196 (d) 1.96
  12. 12.6.8 × 12 — where does the decimal point go? (a) 0.816 (b) 816 (c) 81.6 (d) 8.16
  13. 13.0.21 × 21 — where does the decimal point go? (a) 4.41 (b) 0.441 (c) 0.0441 (d) 44.1
  14. 14.6.2 × 0.3 — where does the decimal point go? (a) 0.186 (b) 18.6 (c) 1.86 (d) 0.0186
  15. 15.0.38 × 0.8 — where does the decimal point go? (a) 0.0304 (b) 0.00304 (c) 0.304 (d) 3.04
  16. 16.5.2 × 18 — where does the decimal point go? (a) 93.6 (b) 9.36 (c) 936 (d) 0.936
  17. 17.0.33 × 1.5 — where does the decimal point go? (a) 0.495 (b) 0.0495 (c) 4.95 (d) 0.00495
  18. 18.0.64 × 6 — where does the decimal point go? (a) 3.84 (b) 0.384 (c) 38.4 (d) 0.0384
  19. 19.3.1 × 28 — where does the decimal point go? (a) 86.8 (b) 868 (c) 0.868 (d) 8.68
  20. 20.4.8 × 2.1 — where does the decimal point go? (a) 1.008 (b) 100.8 (c) 10.08 (d) 0.1008
  21. 21.0.17 × 2 — where does the decimal point go? (a) 0.34 (b) 0.0034 (c) 3.4 (d) 0.034
  22. 22.0.56 × 2 — where does the decimal point go? (a) 11.2 (b) 1.12 (c) 0.112 (d) 0.0112
  23. 23.0.15 × 5 — where does the decimal point go? (a) 0.75 (b) 0.075 (c) 7.5 (d) 0.0075
  24. 24.3.5 × 2.3 — where does the decimal point go? (a) 80.5 (b) 8.05 (c) 0.805 (d) 0.0805
  25. 25.1.8 × 0.7 — where does the decimal point go? (a) 12.6 (b) 1.26 (c) 0.0126 (d) 0.126
  26. 26.0.64 × 9 — where does the decimal point go? (a) 0.0576 (b) 57.6 (c) 0.576 (d) 5.76
  27. 27.6.7 × 15 — where does the decimal point go? (a) 100.5 (b) 10.05 (c) 1005 (d) 1.005
  28. 28.9.5 × 4.3 — where does the decimal point go? (a) 0.4085 (b) 408.5 (c) 40.85 (d) 4.085
  29. 29.4.4 × 0.7 — where does the decimal point go? (a) 30.8 (b) 0.308 (c) 0.0308 (d) 3.08
  30. 30.7.1 × 2 — where does the decimal point go? (a) 14.2 (b) 1.42 (c) 0.142 (d) 142
  31. 31.2.4 × 8 — where does the decimal point go? (a) 19.2 (b) 0.192 (c) 1.92 (d) 192
  32. 32.0.63 × 3.9 — where does the decimal point go? (a) 0.2457 (b) 2.457 (c) 0.02457 (d) 24.57
  33. 33.0.85 × 0.9 — where does the decimal point go? (a) 0.765 (b) 0.00765 (c) 7.65 (d) 0.0765
  34. 34.6.8 × 9 — where does the decimal point go? (a) 0.612 (b) 6.12 (c) 612 (d) 61.2
  35. 35.0.85 × 3 — where does the decimal point go? (a) 0.255 (b) 2.55 (c) 25.5 (d) 0.0255
  36. 36.0.49 × 28 — where does the decimal point go? (a) 137.2 (b) 0.1372 (c) 13.72 (d) 1.372
  37. 37.0.38 × 0.9 — where does the decimal point go? (a) 0.00342 (b) 3.42 (c) 0.0342 (d) 0.342
  38. 38.0.14 × 0.3 — where does the decimal point go? (a) 0.0042 (b) 0.00042 (c) 0.42 (d) 0.042
  39. 39.0.18 × 13 — where does the decimal point go? (a) 2.34 (b) 0.234 (c) 23.4 (d) 0.0234
  40. 40.5.2 × 0.6 — where does the decimal point go? (a) 0.0312 (b) 31.2 (c) 3.12 (d) 0.312

Answer key

  1. 9.84
  2. 0.72
  3. 1.06
  4. 37.5
  5. 57.8
  6. 224.2
  7. 25.16
  8. 6.84
  9. 0.64
  10. 52.8
  11. 1.96
  12. 81.6
  13. 4.41
  14. 1.86
  15. 0.304
  16. 93.6
  17. 0.495
  18. 3.84
  19. 86.8
  20. 10.08
  21. 0.34
  22. 1.12
  23. 0.75
  24. 8.05
  25. 1.26
  26. 5.76
  27. 100.5
  28. 40.85
  29. 3.08
  30. 14.2
  31. 19.2
  32. 2.457
  33. 0.765
  34. 61.2
  35. 2.55
  36. 13.72
  37. 0.342
  38. 0.042
  39. 2.34
  40. 3.12

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