Using counters divide 24 to find the number of equal groups as below.

From the above figure, 3 equal groups of 8 are formed.

So, 24 ÷ 8 = 3.

Using counters divide 16 to find the number of equal groups of 4 each as below.

From the above figure, 4 equal groups of 4 are formed.

16 ÷ 4 = 4

Using counters divide 18 to find the number of equal groups of 6 each as below.

From the above figure, 3 equal groups of 6 are formed.

18 ÷ 6 = 3

Divide 18 triangles into groups of 9.

There are 2 such groups.

Therefore, 18 can be divided into 2 groups each containing 9.

Divide 12 squares into groups of 3.

There are 4 such groups.

Therefore, 12 can be divided into 4 groups each containing 3.

Divide 21 triangles into groups of 7.

There are 3 such groups.

Therefore, 21 can be divided into 3 groups each containing 7.

Sarah arranged 40 books in equal groups of 8.

Divide 40 by 8.

So, Sarah arranged 40 books in 5 groups.

There are 36 blocks.

Dividing 36 into 6 groups, we get 6.

So, each person gets 6 blocks.

Andrew wants to distribute 6 sandwiches equally among 3 friends.

6 sandwiches can be distributed equally among 3 friends as shown with equal number of sandwiches each one will get.

Therefore each one will get 2 sandwiches.

3 children share 15 balloons equally among themselves.

15 balloons can be shared among 3 children equally as shown below with each child getting equal number of balloons.

Therefore each child gets 5 balloons.

7 friends share 14 tacos equally among themselves.

14 tacos can be shared among 7 friends equally as shown below with equal number of tacos each one will get.

Therefore each one will get 2 tacos.