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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 498 · 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. 1.9.7 × 2.8 — where does the decimal point go? (a) 27.16 (b) 0.2716 (c) 271.6 (d) 2.716
  2. 2.0.77 × 0.2 — where does the decimal point go? (a) 0.00154 (b) 0.0154 (c) 1.54 (d) 0.154
  3. 3.0.64 × 6 — where does the decimal point go? (a) 0.0384 (b) 38.4 (c) 0.384 (d) 3.84
  4. 4.7.9 × 0.4 — where does the decimal point go? (a) 0.0316 (b) 31.6 (c) 0.316 (d) 3.16
  5. 5.0.53 × 42 — where does the decimal point go? (a) 22.26 (b) 2.226 (c) 0.2226 (d) 222.6
  6. 6.6.3 × 4 — where does the decimal point go? (a) 252 (b) 2.52 (c) 25.2 (d) 0.252
  7. 7.1.2 × 8 — where does the decimal point go? (a) 0.096 (b) 9.6 (c) 96 (d) 0.96
  8. 8.0.81 × 23 — where does the decimal point go? (a) 18.63 (b) 0.1863 (c) 186.3 (d) 1.863
  9. 9.8.9 × 0.3 — where does the decimal point go? (a) 2.67 (b) 26.7 (c) 0.0267 (d) 0.267
  10. 10.0.37 × 0.5 — where does the decimal point go? (a) 0.00185 (b) 1.85 (c) 0.185 (d) 0.0185
  11. 11.0.89 × 7 — where does the decimal point go? (a) 0.623 (b) 0.0623 (c) 6.23 (d) 62.3
  12. 12.9.1 × 9 — where does the decimal point go? (a) 819 (b) 0.819 (c) 81.9 (d) 8.19
  13. 13.0.54 × 2.3 — where does the decimal point go? (a) 0.1242 (b) 0.01242 (c) 12.42 (d) 1.242
  14. 14.4.8 × 0.3 — where does the decimal point go? (a) 0.0144 (b) 1.44 (c) 14.4 (d) 0.144
  15. 15.2.6 × 7 — where does the decimal point go? (a) 0.182 (b) 182 (c) 18.2 (d) 1.82
  16. 16.0.41 × 7 — where does the decimal point go? (a) 2.87 (b) 0.0287 (c) 28.7 (d) 0.287
  17. 17.8.8 × 13 — where does the decimal point go? (a) 11.44 (b) 1144 (c) 114.4 (d) 1.144
  18. 18.0.53 × 8 — where does the decimal point go? (a) 0.424 (b) 4.24 (c) 0.0424 (d) 42.4
  19. 19.6.4 × 2 — where does the decimal point go? (a) 1.28 (b) 12.8 (c) 128 (d) 0.128
  20. 20.0.84 × 33 — where does the decimal point go? (a) 277.2 (b) 27.72 (c) 0.2772 (d) 2.772
  21. 21.0.74 × 1.8 — where does the decimal point go? (a) 0.01332 (b) 1.332 (c) 0.1332 (d) 13.32
  22. 22.0.19 × 5 — where does the decimal point go? (a) 0.095 (b) 0.0095 (c) 0.95 (d) 9.5
  23. 23.2.2 × 0.6 — where does the decimal point go? (a) 1.32 (b) 13.2 (c) 0.132 (d) 0.0132
  24. 24.0.77 × 0.6 — where does the decimal point go? (a) 4.62 (b) 0.0462 (c) 0.462 (d) 0.00462
  25. 25.6.7 × 3 — where does the decimal point go? (a) 201 (b) 0.201 (c) 2.01 (d) 20.1
  26. 26.1.8 × 2.7 — where does the decimal point go? (a) 48.6 (b) 0.0486 (c) 0.486 (d) 4.86
  27. 27.5.1 × 2 — where does the decimal point go? (a) 10.2 (b) 1.02 (c) 0.102 (d) 102
  28. 28.1.3 × 0.6 — where does the decimal point go? (a) 0.078 (b) 7.8 (c) 0.0078 (d) 0.78
  29. 29.0.49 × 0.3 — where does the decimal point go? (a) 1.47 (b) 0.00147 (c) 0.0147 (d) 0.147
  30. 30.0.79 × 19 — where does the decimal point go? (a) 1.501 (b) 15.01 (c) 0.1501 (d) 150.1
  31. 31.1.8 × 0.4 — where does the decimal point go? (a) 0.72 (b) 0.072 (c) 7.2 (d) 0.0072
  32. 32.9.3 × 2 — where does the decimal point go? (a) 186 (b) 18.6 (c) 1.86 (d) 0.186
  33. 33.0.94 × 48 — where does the decimal point go? (a) 0.4512 (b) 4.512 (c) 45.12 (d) 451.2
  34. 34.4.5 × 3 — where does the decimal point go? (a) 0.135 (b) 1.35 (c) 13.5 (d) 135
  35. 35.0.85 × 4.7 — where does the decimal point go? (a) 0.03995 (b) 0.3995 (c) 39.95 (d) 3.995
  36. 36.0.49 × 0.7 — where does the decimal point go? (a) 0.0343 (b) 0.343 (c) 0.00343 (d) 3.43
  37. 37.5.4 × 0.7 — where does the decimal point go? (a) 3.78 (b) 0.0378 (c) 0.378 (d) 37.8
  38. 38.0.69 × 11 — where does the decimal point go? (a) 75.9 (b) 0.759 (c) 0.0759 (d) 7.59
  39. 39.4.6 × 4.2 — where does the decimal point go? (a) 19.32 (b) 1.932 (c) 0.1932 (d) 193.2
  40. 40.5.7 × 0.7 — where does the decimal point go? (a) 0.0399 (b) 39.9 (c) 0.399 (d) 3.99

Answer key

  1. 27.16
  2. 0.154
  3. 3.84
  4. 3.16
  5. 22.26
  6. 25.2
  7. 9.6
  8. 18.63
  9. 2.67
  10. 0.185
  11. 6.23
  12. 81.9
  13. 1.242
  14. 1.44
  15. 18.2
  16. 2.87
  17. 114.4
  18. 4.24
  19. 12.8
  20. 27.72
  21. 1.332
  22. 0.95
  23. 1.32
  24. 0.462
  25. 20.1
  26. 4.86
  27. 10.2
  28. 0.78
  29. 0.147
  30. 15.01
  31. 0.72
  32. 18.6
  33. 45.12
  34. 13.5
  35. 3.995
  36. 0.343
  37. 3.78
  38. 7.59
  39. 19.32
  40. 3.99

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