1. There are 72 students in grade five and 66 students in grade six in a primary school. If the school wants to organize students of two grades to participate in extracurricular activities, they need to be grouped according to grades. What is the maximum number of people in each group to make each group the same? At this time, the fifth and sixth grades were divided into several groups.

The greatest common divisor of 72 and 66 is 6.

So there are no more than six people in each group.

The fifth grade is divided into 72 ÷ 6 = 12 groups.

The sixth grade is divided into 66 ÷ 6 = 1 1 group.

The school bought three ropes for skipping rope. The length of the three ropes is/kloc-0 14m.35m.28m Now we have to cut them into short ropes with the same length, and there can be no extra. What is the longest short rope cut? How many short ropes of this length can you cut?

The greatest common divisor of14,35,28 is 7.

So the longest short rope cut is 7 meters.

It can be cut into (14+35+28) ÷ 7 =11.