Find 80% of the area of a rectangle with sides 25 cm and 16 cm.

Find the total area of the rectangle.

To find the area of a rectangle, you need to multiply the length by the width.

25 * 16 = 400 (cm²) – the area of the rectangle.

Let’s find how many cm² is 1% of the area.

400: 100 = 4 (cm²) – 1% of the area.

Let’s find how many cm² is 80% of the area.

The amount that is 1% must be multiplied by 80.

4 * 80 = 320 (cm²) – 80% of the area.

Answer: 320 cm² is 80% of the area.