Question

how many millimeters are in 21 centimeters?
○ 21 millimeters
○ 210 millimeters
○ 2,100 millimeters
○ 21,000 millimeters

question 2 (multiple choice worth 5 points)
(12.02 lc)
how many meters are in 7 kilometers?
○ 7,000 meters
○ 700 meters
○ 70 meters
○ 7 meters

Explanation:

First Question (How many millimeters are in 21 centimeters?):

Step1: Recall the conversion factor

We know that \( 1 \text{ centimeter} = 10 \text{ millimeters} \).

Step2: Multiply the number of centimeters by the conversion factor

To find the number of millimeters in 21 centimeters, we multiply 21 by 10. So, \( 21 \times 10 = 210 \).

Step1: Recall the conversion factor

We know that \( 1 \text{ kilometer} = 1000 \text{ meters} \).

Step2: Multiply the number of kilometers by the conversion factor

To find the number of meters in 7 kilometers, we multiply 7 by 1000. So, \( 7 \times 1000 = 7000 \).

Answer:

210 millimeters (corresponding to the option "210 millimeters")

Second Question (How many meters are in 7 kilometers?):