Question

A 30-cm ruler broke into two pieces. One piece was 120 mm long. How

long was the other piece? Express your answer in millimeters.

Answer 1

Answer: 180 mm

Step-by-step explanation:

1 cm = 10 mm

10 cm = 100 mm

30 cm = 300 mm

300 - 120 = 180

Hope this helps!

Answer 2

The total length of the ruler in millimeters is 300 mm. After subtracting the 120 mm piece, we find that the other piece of the ruler is 180 mm long.

Step-by-step explanation:

This is a simple subtraction problem in mathematics. The ruler's total length is 30 cm and since 1 cm equals 10 mm, the whole ruler length is 300 mm. You already know that one piece of the ruler is 120 mm. To find the length of the other piece, you need to subtract the length of the first piece from the total length. So the calculation would be:

• 300 mm (Total length) - 120 mm (Length of one piece) = 180 mm (Length of the other piece)

So, the other piece of the ruler is 180 mm long.

Learn more about Subtraction