Question

1. a plumber needed a pipe 83 millimeters long. what is this length in centimeters?

830 cm
0.83 cm
8.30 cm
8300 cm

1. death valley is about 209 kilometers long. what is the length of death valley in meters?

209,000 meters
2,090,000 meters

Explanation:

Step1: Convert mm to cm (Q1)

Recall $1\ \text{cm} = 10\ \text{mm}$, so divide by 10:
$\frac{83}{10} = 8.30$

Step2: Convert km to m (Q2)

Recall $1\ \text{km} = 1000\ \text{m}$, so multiply by 1000:
$209 \times 1000 = 209000$

Answer:

1. 8.30 cm
2. 209,000 meters