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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 877 · 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. 1.8.9 × 8 — where does the decimal point go? (a) 7.12 (b) 0.712 (c) 712 (d) 71.2
  2. 2.6.8 × 33 — where does the decimal point go? (a) 22.44 (b) 224.4 (c) 2244 (d) 2.244
  3. 3.4.2 × 14 — where does the decimal point go? (a) 58.8 (b) 588 (c) 0.588 (d) 5.88
  4. 4.0.13 × 5 — where does the decimal point go? (a) 0.065 (b) 0.0065 (c) 6.5 (d) 0.65
  5. 5.0.97 × 6 — where does the decimal point go? (a) 58.2 (b) 0.0582 (c) 0.582 (d) 5.82
  6. 6.2.1 × 2 — where does the decimal point go? (a) 0.42 (b) 0.042 (c) 42 (d) 4.2
  7. 7.3.7 × 0.5 — where does the decimal point go? (a) 18.5 (b) 1.85 (c) 0.0185 (d) 0.185
  8. 8.1.5 × 2.9 — where does the decimal point go? (a) 43.5 (b) 4.35 (c) 0.0435 (d) 0.435
  9. 9.4.2 × 4 — where does the decimal point go? (a) 16.8 (b) 168 (c) 1.68 (d) 0.168
  10. 10.7.4 × 2 — where does the decimal point go? (a) 1.48 (b) 148 (c) 0.148 (d) 14.8
  11. 11.0.36 × 2 — where does the decimal point go? (a) 0.72 (b) 7.2 (c) 0.0072 (d) 0.072
  12. 12.0.57 × 3 — where does the decimal point go? (a) 1.71 (b) 0.171 (c) 0.0171 (d) 17.1
  13. 13.7.5 × 1.1 — where does the decimal point go? (a) 0.825 (b) 8.25 (c) 0.0825 (d) 82.5
  14. 14.0.21 × 4.5 — where does the decimal point go? (a) 0.945 (b) 0.00945 (c) 0.0945 (d) 9.45
  15. 15.0.91 × 1.5 — where does the decimal point go? (a) 1.365 (b) 0.01365 (c) 13.65 (d) 0.1365
  16. 16.0.29 × 37 — where does the decimal point go? (a) 1.073 (b) 10.73 (c) 107.3 (d) 0.1073
  17. 17.2.8 × 4 — where does the decimal point go? (a) 1.12 (b) 0.112 (c) 11.2 (d) 112
  18. 18.0.77 × 2 — where does the decimal point go? (a) 1.54 (b) 0.154 (c) 0.0154 (d) 15.4
  19. 19.0.66 × 0.3 — where does the decimal point go? (a) 0.198 (b) 0.0198 (c) 0.00198 (d) 1.98
  20. 20.3.8 × 4.6 — where does the decimal point go? (a) 174.8 (b) 17.48 (c) 1.748 (d) 0.1748
  21. 21.0.74 × 8 — where does the decimal point go? (a) 5.92 (b) 0.0592 (c) 0.592 (d) 59.2
  22. 22.1.6 × 1.6 — where does the decimal point go? (a) 2.56 (b) 25.6 (c) 0.0256 (d) 0.256
  23. 23.6.9 × 5 — where does the decimal point go? (a) 345 (b) 0.345 (c) 34.5 (d) 3.45
  24. 24.5.7 × 7 — where does the decimal point go? (a) 399 (b) 39.9 (c) 3.99 (d) 0.399
  25. 25.4.4 × 3.8 — where does the decimal point go? (a) 0.1672 (b) 167.2 (c) 16.72 (d) 1.672
  26. 26.3.3 × 8 — where does the decimal point go? (a) 2.64 (b) 26.4 (c) 264 (d) 0.264
  27. 27.0.17 × 0.6 — where does the decimal point go? (a) 0.00102 (b) 0.102 (c) 0.0102 (d) 1.02
  28. 28.0.36 × 0.4 — where does the decimal point go? (a) 0.144 (b) 0.0144 (c) 1.44 (d) 0.00144
  29. 29.2.5 × 2.1 — where does the decimal point go? (a) 5.25 (b) 52.5 (c) 0.525 (d) 0.0525
  30. 30.8.1 × 36 — where does the decimal point go? (a) 2.916 (b) 291.6 (c) 2916 (d) 29.16
  31. 31.9.4 × 41 — where does the decimal point go? (a) 38.54 (b) 3854 (c) 3.854 (d) 385.4
  32. 32.2.7 × 0.9 — where does the decimal point go? (a) 0.243 (b) 0.0243 (c) 2.43 (d) 24.3
  33. 33.0.47 × 2.6 — where does the decimal point go? (a) 0.1222 (b) 0.01222 (c) 12.22 (d) 1.222
  34. 34.0.58 × 3 — where does the decimal point go? (a) 0.0174 (b) 0.174 (c) 1.74 (d) 17.4
  35. 35.0.16 × 4 — where does the decimal point go? (a) 6.4 (b) 0.064 (c) 0.0064 (d) 0.64
  36. 36.0.26 × 0.4 — where does the decimal point go? (a) 0.00104 (b) 0.104 (c) 1.04 (d) 0.0104
  37. 37.0.28 × 23 — where does the decimal point go? (a) 0.0644 (b) 64.4 (c) 0.644 (d) 6.44
  38. 38.5.9 × 0.3 — where does the decimal point go? (a) 0.177 (b) 17.7 (c) 0.0177 (d) 1.77
  39. 39.1.7 × 0.8 — where does the decimal point go? (a) 0.0136 (b) 1.36 (c) 13.6 (d) 0.136
  40. 40.3.6 × 6 — where does the decimal point go? (a) 21.6 (b) 2.16 (c) 216 (d) 0.216

Answer key

  1. 71.2
  2. 224.4
  3. 58.8
  4. 0.65
  5. 5.82
  6. 4.2
  7. 1.85
  8. 4.35
  9. 16.8
  10. 14.8
  11. 0.72
  12. 1.71
  13. 8.25
  14. 0.945
  15. 1.365
  16. 10.73
  17. 11.2
  18. 1.54
  19. 0.198
  20. 17.48
  21. 5.92
  22. 2.56
  23. 34.5
  24. 39.9
  25. 16.72
  26. 26.4
  27. 0.102
  28. 0.144
  29. 5.25
  30. 291.6
  31. 385.4
  32. 2.43
  33. 1.222
  34. 1.74
  35. 0.64
  36. 0.104
  37. 6.44
  38. 1.77
  39. 1.36
  40. 21.6

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