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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 194 · 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. 1.7.9 × 0.4 — where does the decimal point go? (a) 0.316 (b) 31.6 (c) 0.0316 (d) 3.16
  2. 2.0.31 × 36 — where does the decimal point go? (a) 1.116 (b) 111.6 (c) 0.1116 (d) 11.16
  3. 3.9.3 × 1.1 — where does the decimal point go? (a) 10.23 (b) 102.3 (c) 1.023 (d) 0.1023
  4. 4.4.4 × 0.3 — where does the decimal point go? (a) 0.0132 (b) 13.2 (c) 0.132 (d) 1.32
  5. 5.8.9 × 5 — where does the decimal point go? (a) 44.5 (b) 0.445 (c) 4.45 (d) 445
  6. 6.0.76 × 6 — where does the decimal point go? (a) 0.456 (b) 4.56 (c) 45.6 (d) 0.0456
  7. 7.0.22 × 0.8 — where does the decimal point go? (a) 0.00176 (b) 0.0176 (c) 0.176 (d) 1.76
  8. 8.3.8 × 1.4 — where does the decimal point go? (a) 0.532 (b) 0.0532 (c) 53.2 (d) 5.32
  9. 9.0.77 × 8 — where does the decimal point go? (a) 6.16 (b) 0.616 (c) 61.6 (d) 0.0616
  10. 10.3.2 × 14 — where does the decimal point go? (a) 44.8 (b) 4.48 (c) 0.448 (d) 448
  11. 11.0.73 × 42 — where does the decimal point go? (a) 3.066 (b) 30.66 (c) 306.6 (d) 0.3066
  12. 12.4.9 × 0.7 — where does the decimal point go? (a) 0.343 (b) 3.43 (c) 34.3 (d) 0.0343
  13. 13.1.9 × 8 — where does the decimal point go? (a) 1.52 (b) 0.152 (c) 15.2 (d) 152
  14. 14.0.64 × 0.7 — where does the decimal point go? (a) 0.0448 (b) 4.48 (c) 0.448 (d) 0.00448
  15. 15.2.9 × 8 — where does the decimal point go? (a) 232 (b) 0.232 (c) 2.32 (d) 23.2
  16. 16.7.2 × 2.3 — where does the decimal point go? (a) 165.6 (b) 1.656 (c) 16.56 (d) 0.1656
  17. 17.0.34 × 9 — where does the decimal point go? (a) 0.306 (b) 30.6 (c) 0.0306 (d) 3.06
  18. 18.9.3 × 0.8 — where does the decimal point go? (a) 0.0744 (b) 7.44 (c) 74.4 (d) 0.744
  19. 19.0.21 × 9 — where does the decimal point go? (a) 0.189 (b) 1.89 (c) 18.9 (d) 0.0189
  20. 20.2.1 × 3.5 — where does the decimal point go? (a) 0.0735 (b) 7.35 (c) 0.735 (d) 73.5
  21. 21.0.52 × 6 — where does the decimal point go? (a) 0.0312 (b) 31.2 (c) 0.312 (d) 3.12
  22. 22.2.6 × 16 — where does the decimal point go? (a) 0.416 (b) 41.6 (c) 4.16 (d) 416
  23. 23.0.64 × 4 — where does the decimal point go? (a) 2.56 (b) 25.6 (c) 0.256 (d) 0.0256
  24. 24.3.1 × 3 — where does the decimal point go? (a) 9.3 (b) 0.93 (c) 0.093 (d) 93
  25. 25.3.7 × 11 — where does the decimal point go? (a) 407 (b) 0.407 (c) 4.07 (d) 40.7
  26. 26.0.95 × 5 — where does the decimal point go? (a) 0.0475 (b) 0.475 (c) 4.75 (d) 47.5
  27. 27.0.47 × 8 — where does the decimal point go? (a) 0.0376 (b) 3.76 (c) 37.6 (d) 0.376
  28. 28.0.84 × 8 — where does the decimal point go? (a) 0.672 (b) 0.0672 (c) 6.72 (d) 67.2
  29. 29.0.63 × 49 — where does the decimal point go? (a) 0.3087 (b) 3.087 (c) 30.87 (d) 308.7
  30. 30.0.68 × 7 — where does the decimal point go? (a) 0.0476 (b) 0.476 (c) 4.76 (d) 47.6
  31. 31.0.22 × 1.7 — where does the decimal point go? (a) 0.374 (b) 0.0374 (c) 3.74 (d) 0.00374
  32. 32.0.57 × 7 — where does the decimal point go? (a) 0.0399 (b) 39.9 (c) 0.399 (d) 3.99
  33. 33.0.98 × 12 — where does the decimal point go? (a) 11.76 (b) 0.1176 (c) 1.176 (d) 117.6
  34. 34.3.3 × 5 — where does the decimal point go? (a) 16.5 (b) 0.165 (c) 165 (d) 1.65
  35. 35.0.52 × 1.6 — where does the decimal point go? (a) 8.32 (b) 0.00832 (c) 0.832 (d) 0.0832
  36. 36.9.2 × 9 — where does the decimal point go? (a) 82.8 (b) 828 (c) 0.828 (d) 8.28
  37. 37.7.1 × 0.2 — where does the decimal point go? (a) 1.42 (b) 0.0142 (c) 14.2 (d) 0.142
  38. 38.0.64 × 0.4 — where does the decimal point go? (a) 2.56 (b) 0.00256 (c) 0.0256 (d) 0.256
  39. 39.5.7 × 7 — where does the decimal point go? (a) 0.399 (b) 39.9 (c) 399 (d) 3.99
  40. 40.7.2 × 14 — where does the decimal point go? (a) 10.08 (b) 100.8 (c) 1.008 (d) 1008

Answer key

  1. 3.16
  2. 11.16
  3. 10.23
  4. 1.32
  5. 44.5
  6. 4.56
  7. 0.176
  8. 5.32
  9. 6.16
  10. 44.8
  11. 30.66
  12. 3.43
  13. 15.2
  14. 0.448
  15. 23.2
  16. 16.56
  17. 3.06
  18. 7.44
  19. 1.89
  20. 7.35
  21. 3.12
  22. 41.6
  23. 2.56
  24. 9.3
  25. 40.7
  26. 4.75
  27. 3.76
  28. 6.72
  29. 30.87
  30. 4.76
  31. 0.374
  32. 3.99
  33. 11.76
  34. 16.5
  35. 0.832
  36. 82.8
  37. 1.42
  38. 0.256
  39. 39.9
  40. 100.8

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