Question

There are 15 classes in a school.In each class, there are 22 boys and 28 girls. Find a total number of students in a school ? Which property of whole number would you use to quickly find the answer ​

Answer 1

Total no. Of students in each class= 22+28=50

Now, total students= 15x50 =750

For quick answer, we will use distributive property of multiplication over addition.

= 15(22+28)

=15 x 22 + 15 x 28

=330+420

=750