Question

Bob weighs 42 kg. Express his weight in grams.

• A. 4200 g
• B. 12,000 g
• C. 420,000 g
• D. 42,000 g

Answer 1

The correct option is D 42,000 g


When we go from a unit at the top to a unit right below it, we multiply by 10.

Bob's weight = 42 kg

We need to express this weight in g.

To convert kg to g, we need to move 3 units down.

Thus, we multiply by 10 thrice.

$\therefore 1\text{kg}=10\times 10\times 10=1000\text{g}$

$\therefore 42\text{kg}=42\times 1000=42000\text{g}$

Thus, Bob's weight in grams is 42,000 g.