Area All-Stars
Find the area of a rectangle with 4 rows and 5 columns.
20 square units
Find the perimeter of a square with 4 sides that are each 5 units long.
20 units
How many squares are in an array with 3 rows and 4 columns?
12
A rectangle has an area of 12 square units. One side is 3 units. What is the other side?
4 units
A garden is 4 units long and 3 units wide. What is the area?
12 square units
A rectangle is 6 units long and 3 units wide. What is the area?
18 square units
A rectangle is 6 units long and 3 units wide. What is the perimeter?
18 units
Draw an array for 5 × 4. How many total squares are there?
20
The perimeter is 18 units. Three sides are 4 units. What is the missing side?
6 units
A dog pen is 5 units by 5 units. How much fencing is needed?
20 units (perimeter)
A rectangle has 8 rows and 4 columns. Write a multiplication sentence and find the area.
8 × 4 = 32 square units
Add the side lengths: 5 + 8 + 5 + 8. What does this represent?
Perimeter = 26 units
Which multiplication sentence matches an array with 6 rows and 3 columns?
6 × 3 = 18
A rectangle has an area of 30 square units and one side is 5 units. Find the missing side.
6 units
A classroom has a rug that is 8 units long and 6 units wide. What is the area?
48 square units
A rectangle has an area of 24 square units and one side is 6 units. What is the missing side?
4 units (24 ÷ 6)
A rectangle has a perimeter of 20 units. Two sides are 6 units each. What are the other two sides?
4 units each
An array has 24 squares. Give two different multiplication sentences that could match it.
1 x 24
2 x 12
3 x 8 and 6 × 4
A rectangle’s perimeter is 24 units. Two sides are 7 units each. Find the other sides.
5 units each
A playground is 10 units long and 4 units wide. Is area or perimeter better to find how much space kids have to play? Why?
Area, because it shows total space inside.
A classroom rug has 7 rows of 6 squares. What is the total area?
42 square units
Which is larger: the perimeter of a 6 × 4 rectangle or a 5 × 5 square?
6 × 4 → Perimeter = 20
5 × 5 → Perimeter = 20
They are equal
Explain how arrays help us find area.
Arrays show rows and columns, which connect to multiplication to find area.
Explain how you know whether to use multiplication or division to find a missing side.
Use multiplication to find total area; use division to find a missing side.
You are building a fence around a rectangular yard. Do you need area or perimeter? Explain.
Perimeter, because fencing goes around the outside.