Question

Isabella walks 1.5 kilometers daily in the evening. How many meters does she cover in a week?

• A. 10500

Answer 1

The correct option is A 10500
Isabella covers 1.5 km each day.
$\therefore$ In 7 days, she will cover $7\times 1.5$ km.

Let's multiply 7 with 15 first.
$7\times 15=105$

As the decimal point of 1.5 is in the left of ones place digit of 15, the decimal point in the multiplication should be in left of ones place digit of 105, i.e., 10.5 km.

$\therefore 7\times 1.5\text{km}=10.5\text{km}$

Now, as the answer is required in meters, we need to convert the unit.

We know, $1\text{km}=1,000\text{m}\therefore 10.5\text{km}=10.5\times 1000\text{m}\Rightarrow 10.5\text{km}=10,500\text{m}$