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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 866 · 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. 1.9.6 × 1.7 — where does the decimal point go? (a) 163.2 (b) 1.632 (c) 0.1632 (d) 16.32
  2. 2.0.85 × 0.5 — where does the decimal point go? (a) 0.0425 (b) 4.25 (c) 0.425 (d) 0.00425
  3. 3.0.36 × 8 — where does the decimal point go? (a) 0.288 (b) 2.88 (c) 28.8 (d) 0.0288
  4. 4.8.2 × 0.4 — where does the decimal point go? (a) 0.0328 (b) 32.8 (c) 0.328 (d) 3.28
  5. 5.6.5 × 49 — where does the decimal point go? (a) 318.5 (b) 3185 (c) 3.185 (d) 31.85
  6. 6.0.97 × 0.7 — where does the decimal point go? (a) 0.00679 (b) 0.0679 (c) 6.79 (d) 0.679
  7. 7.7.9 × 3 — where does the decimal point go? (a) 2.37 (b) 237 (c) 23.7 (d) 0.237
  8. 8.7.1 × 4 — where does the decimal point go? (a) 2.84 (b) 28.4 (c) 0.284 (d) 284
  9. 9.5.2 × 3.8 — where does the decimal point go? (a) 1.976 (b) 19.76 (c) 0.1976 (d) 197.6
  10. 10.5.1 × 8 — where does the decimal point go? (a) 4.08 (b) 408 (c) 40.8 (d) 0.408
  11. 11.0.61 × 2.9 — where does the decimal point go? (a) 0.1769 (b) 17.69 (c) 1.769 (d) 0.01769
  12. 12.0.41 × 0.8 — where does the decimal point go? (a) 0.00328 (b) 0.328 (c) 0.0328 (d) 3.28
  13. 13.4.7 × 4.7 — where does the decimal point go? (a) 22.09 (b) 2.209 (c) 220.9 (d) 0.2209
  14. 14.0.96 × 0.4 — where does the decimal point go? (a) 0.00384 (b) 0.0384 (c) 3.84 (d) 0.384
  15. 15.3.2 × 9 — where does the decimal point go? (a) 28.8 (b) 2.88 (c) 288 (d) 0.288
  16. 16.0.59 × 4 — where does the decimal point go? (a) 23.6 (b) 0.0236 (c) 2.36 (d) 0.236
  17. 17.0.73 × 4 — where does the decimal point go? (a) 2.92 (b) 29.2 (c) 0.292 (d) 0.0292
  18. 18.0.46 × 0.8 — where does the decimal point go? (a) 0.368 (b) 0.0368 (c) 0.00368 (d) 3.68
  19. 19.0.45 × 2.3 — where does the decimal point go? (a) 0.01035 (b) 10.35 (c) 0.1035 (d) 1.035
  20. 20.7.6 × 8 — where does the decimal point go? (a) 608 (b) 6.08 (c) 60.8 (d) 0.608
  21. 21.9.1 × 1.5 — where does the decimal point go? (a) 13.65 (b) 0.1365 (c) 1.365 (d) 136.5
  22. 22.0.72 × 3 — where does the decimal point go? (a) 2.16 (b) 21.6 (c) 0.0216 (d) 0.216
  23. 23.6.8 × 6 — where does the decimal point go? (a) 0.408 (b) 40.8 (c) 408 (d) 4.08
  24. 24.1.2 × 19 — where does the decimal point go? (a) 22.8 (b) 2.28 (c) 228 (d) 0.228
  25. 25.2.6 × 2.4 — where does the decimal point go? (a) 0.624 (b) 0.0624 (c) 6.24 (d) 62.4
  26. 26.3.7 × 7 — where does the decimal point go? (a) 0.259 (b) 25.9 (c) 2.59 (d) 259
  27. 27.4.3 × 47 — where does the decimal point go? (a) 2.021 (b) 202.1 (c) 20.21 (d) 2021
  28. 28.2.1 × 3.2 — where does the decimal point go? (a) 6.72 (b) 0.672 (c) 0.0672 (d) 67.2
  29. 29.0.98 × 0.2 — where does the decimal point go? (a) 0.00196 (b) 0.196 (c) 0.0196 (d) 1.96
  30. 30.4.9 × 0.9 — where does the decimal point go? (a) 0.0441 (b) 4.41 (c) 44.1 (d) 0.441
  31. 31.2.4 × 2.4 — where does the decimal point go? (a) 5.76 (b) 0.576 (c) 57.6 (d) 0.0576
  32. 32.0.24 × 0.7 — where does the decimal point go? (a) 0.00168 (b) 0.0168 (c) 0.168 (d) 1.68
  33. 33.0.33 × 8 — where does the decimal point go? (a) 2.64 (b) 0.264 (c) 26.4 (d) 0.0264
  34. 34.5.3 × 0.9 — where does the decimal point go? (a) 4.77 (b) 47.7 (c) 0.0477 (d) 0.477
  35. 35.7.6 × 0.9 — where does the decimal point go? (a) 0.0684 (b) 6.84 (c) 68.4 (d) 0.684
  36. 36.8.1 × 42 — where does the decimal point go? (a) 340.2 (b) 3402 (c) 3.402 (d) 34.02
  37. 37.0.87 × 0.9 — where does the decimal point go? (a) 0.783 (b) 0.00783 (c) 7.83 (d) 0.0783
  38. 38.0.77 × 0.5 — where does the decimal point go? (a) 3.85 (b) 0.0385 (c) 0.00385 (d) 0.385
  39. 39.0.39 × 0.4 — where does the decimal point go? (a) 0.00156 (b) 0.0156 (c) 1.56 (d) 0.156
  40. 40.0.19 × 8 — where does the decimal point go? (a) 0.0152 (b) 0.152 (c) 1.52 (d) 15.2

Answer key

  1. 16.32
  2. 0.425
  3. 2.88
  4. 3.28
  5. 318.5
  6. 0.679
  7. 23.7
  8. 28.4
  9. 19.76
  10. 40.8
  11. 1.769
  12. 0.328
  13. 22.09
  14. 0.384
  15. 28.8
  16. 2.36
  17. 2.92
  18. 0.368
  19. 1.035
  20. 60.8
  21. 13.65
  22. 2.16
  23. 40.8
  24. 22.8
  25. 6.24
  26. 25.9
  27. 202.1
  28. 6.72
  29. 0.196
  30. 4.41
  31. 5.76
  32. 0.168
  33. 2.64
  34. 4.77
  35. 6.84
  36. 340.2
  37. 0.783
  38. 0.385
  39. 0.156
  40. 1.52

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