Draw 3 segments AB = 1dm2cm, CD = 7cm and EF, the length of which is equal to the difference

Draw 3 segments AB = 1dm2cm, CD = 7cm and EF, the length of which is equal to the difference between the lengths of segments AB and CD.

In order to find the length of the segment EF, you need to find out the difference between the lengths of the segments AB and CD.

To work with numbers, you need to translate everything into one unit of measurement. Here it will be most convenient to convert all numbers to centimeters.

As we know, a decimeter is a unit of measurement that is equal to ten centimeters.

To find out the length of the segment AB, you need to add 1 dm. To 2 cm, that is, 10 cm:

2 + 10 = 12 cm.

Now let’s find out the length of the segment EF:

12 – 7 = 5 cm.

Answer: the length of the segment EF is 5 cm.