Question

Sis needs help with problem 3 I really don't get it or don't remember how to do it?

Answer 1

Problem 3 would be 30 just count the units going around the shape

Answer 2

I believe 24 cm is the perimeter... perimeter is the how long the border of the shape is so just count all the little squares that make up the shape... Your sister was right in counting the squares but might have counted a few extra..