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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 208 · 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. 1.0.16 × 0.8 — where does the decimal point go? (a) 0.128 (b) 0.0128 (c) 1.28 (d) 0.00128
  2. 2.0.29 × 15 — where does the decimal point go? (a) 4.35 (b) 43.5 (c) 0.435 (d) 0.0435
  3. 3.8.8 × 9 — where does the decimal point go? (a) 7.92 (b) 792 (c) 79.2 (d) 0.792
  4. 4.0.76 × 3 — where does the decimal point go? (a) 22.8 (b) 0.228 (c) 0.0228 (d) 2.28
  5. 5.5.5 × 2.7 — where does the decimal point go? (a) 0.1485 (b) 14.85 (c) 148.5 (d) 1.485
  6. 6.3.8 × 12 — where does the decimal point go? (a) 4.56 (b) 45.6 (c) 0.456 (d) 456
  7. 7.0.27 × 9 — where does the decimal point go? (a) 0.0243 (b) 2.43 (c) 24.3 (d) 0.243
  8. 8.1.6 × 0.8 — where does the decimal point go? (a) 12.8 (b) 0.128 (c) 0.0128 (d) 1.28
  9. 9.0.63 × 0.5 — where does the decimal point go? (a) 0.0315 (b) 0.315 (c) 0.00315 (d) 3.15
  10. 10.0.37 × 37 — where does the decimal point go? (a) 136.9 (b) 1.369 (c) 13.69 (d) 0.1369
  11. 11.5.3 × 0.8 — where does the decimal point go? (a) 0.0424 (b) 4.24 (c) 42.4 (d) 0.424
  12. 12.0.84 × 7 — where does the decimal point go? (a) 5.88 (b) 0.588 (c) 58.8 (d) 0.0588
  13. 13.0.74 × 3 — where does the decimal point go? (a) 0.0222 (b) 2.22 (c) 22.2 (d) 0.222
  14. 14.2.4 × 8 — where does the decimal point go? (a) 192 (b) 1.92 (c) 0.192 (d) 19.2
  15. 15.4.2 × 0.8 — where does the decimal point go? (a) 3.36 (b) 0.336 (c) 0.0336 (d) 33.6
  16. 16.8.3 × 2 — where does the decimal point go? (a) 1.66 (b) 16.6 (c) 166 (d) 0.166
  17. 17.0.86 × 0.3 — where does the decimal point go? (a) 0.0258 (b) 0.258 (c) 2.58 (d) 0.00258
  18. 18.1.3 × 46 — where does the decimal point go? (a) 5.98 (b) 598 (c) 59.8 (d) 0.598
  19. 19.2.9 × 2 — where does the decimal point go? (a) 0.058 (b) 58 (c) 0.58 (d) 5.8
  20. 20.8.9 × 1.8 — where does the decimal point go? (a) 1.602 (b) 160.2 (c) 0.1602 (d) 16.02
  21. 21.5.2 × 4 — where does the decimal point go? (a) 20.8 (b) 2.08 (c) 0.208 (d) 208
  22. 22.0.49 × 9 — where does the decimal point go? (a) 4.41 (b) 0.0441 (c) 0.441 (d) 44.1
  23. 23.0.29 × 3 — where does the decimal point go? (a) 0.0087 (b) 8.7 (c) 0.087 (d) 0.87
  24. 24.8.7 × 11 — where does the decimal point go? (a) 0.957 (b) 9.57 (c) 957 (d) 95.7
  25. 25.8.3 × 3.4 — where does the decimal point go? (a) 0.2822 (b) 2.822 (c) 28.22 (d) 282.2
  26. 26.4.2 × 3.1 — where does the decimal point go? (a) 0.1302 (b) 130.2 (c) 1.302 (d) 13.02
  27. 27.0.67 × 2 — where does the decimal point go? (a) 0.134 (b) 1.34 (c) 13.4 (d) 0.0134
  28. 28.3.6 × 2 — where does the decimal point go? (a) 0.072 (b) 72 (c) 7.2 (d) 0.72
  29. 29.0.48 × 26 — where does the decimal point go? (a) 12.48 (b) 0.1248 (c) 124.8 (d) 1.248
  30. 30.6.9 × 28 — where does the decimal point go? (a) 19.32 (b) 193.2 (c) 1.932 (d) 1932
  31. 31.9.7 × 12 — where does the decimal point go? (a) 116.4 (b) 1164 (c) 11.64 (d) 1.164
  32. 32.3.3 × 2 — where does the decimal point go? (a) 66 (b) 0.066 (c) 0.66 (d) 6.6
  33. 33.0.68 × 31 — where does the decimal point go? (a) 2.108 (b) 21.08 (c) 210.8 (d) 0.2108
  34. 34.0.23 × 7 — where does the decimal point go? (a) 1.61 (b) 0.161 (c) 0.0161 (d) 16.1
  35. 35.9.5 × 9 — where does the decimal point go? (a) 85.5 (b) 8.55 (c) 855 (d) 0.855
  36. 36.0.98 × 2.4 — where does the decimal point go? (a) 2.352 (b) 23.52 (c) 0.02352 (d) 0.2352
  37. 37.1.5 × 0.3 — where does the decimal point go? (a) 0.0045 (b) 0.045 (c) 0.45 (d) 4.5
  38. 38.0.68 × 0.9 — where does the decimal point go? (a) 0.00612 (b) 6.12 (c) 0.612 (d) 0.0612
  39. 39.9.1 × 1.4 — where does the decimal point go? (a) 12.74 (b) 1.274 (c) 0.1274 (d) 127.4
  40. 40.0.78 × 0.8 — where does the decimal point go? (a) 0.624 (b) 0.00624 (c) 0.0624 (d) 6.24

Answer key

  1. 0.128
  2. 4.35
  3. 79.2
  4. 2.28
  5. 14.85
  6. 45.6
  7. 2.43
  8. 1.28
  9. 0.315
  10. 13.69
  11. 4.24
  12. 5.88
  13. 2.22
  14. 19.2
  15. 3.36
  16. 16.6
  17. 0.258
  18. 59.8
  19. 5.8
  20. 16.02
  21. 20.8
  22. 4.41
  23. 0.87
  24. 95.7
  25. 28.22
  26. 13.02
  27. 1.34
  28. 7.2
  29. 12.48
  30. 193.2
  31. 116.4
  32. 6.6
  33. 21.08
  34. 1.61
  35. 85.5
  36. 2.352
  37. 0.45
  38. 0.612
  39. 12.74
  40. 0.624

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