I have problem with these two problems. Please explain or Correct them. These are the problems from Exponents and powers chapter tests grade 8.

I am sure the conversion factor taken is wrong.

**Q17.**

*Use the following information to answer the next question.*

Some paper sheets (each of thickness 0.015 mm) are piled together in a stack. The thickness of the stack is 2.4 × 10^{−4}m.

How many paper sheets are there in the stack?

**A :**

16

**B :**

36

**C :**

160

**D :**

360

Thickness of each paper = 0.015 mm

Thickness of the stack = 2.4 × 10^{−4}m

∴ Number of paper sheets in the stack

= 1.6 × 10^{−4 + 5}

= 1.6 × 10

= 16

The correct answer is A.

** **

**Q18.**

If the area of a piece of paper is 6 square millimetres, then what is the area of the piece of paper in square metres?

**A :**

6 × 10^{−3}

**B :**

6 × 10^{−4}

**C :**

6 × 10^{−6}

**D :**

6 × 10^{−8}

Area of the piece of paper = 6 mm^{2}

We know that,

1000 mm = 1 m

The correct answer is C.

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