7. Measurement

Lesson

If we can add three or more numbers together, that can help us in this lesson. Let's try this problem to practice.

Solve 40 + 20 + 3.

Worked Solution

Idea summary

When adding numbers we can use a number line or add digits by place value.

This video looks at using the properties of rectangles to calculate the perimeter, it also talks about some special notation that is often used to show when two sides have the same length.

Find the perimeter of the rectangle shown.

Worked Solution

Idea summary

Because a rectangle has 2 pairs of sides with equal length, we can add the length and width, then double it, to find the perimeter of a rectangle.

A square is a special kind of rectangle, with 4 sides the same length, so we can multiply its side length by 4.