Question 11
Fractions, Decimals and ApproximationThe thickness of an 800-page book is 18mm. Calculate the thickness of one leaf of the book giving your answers in metres and in standard form.
- A.2.25 × 10−4m
- B.4.50 × 10−4m
- C.2.25 × 10−5m
- D.4.50 × 10−5m
Show the answer and explanation
Answer: D (4.50 × 10−5m)
Explanation
18mm = 0.018m. Each leaf carries two pages, so the book has 400 leaves. One leaf = 0.018 ÷ 400 = 0.000045 = 4.50 × 10−5m.