The pavement of a sidewalk needs 80 pieces of cement bricks with a side length of 3 decimeters. How many pieces of cement bricks with a side length of 4 decimeters There must be a formula The pavement of a sidewalk needs 80 pieces of cement bricks with a side length of 3 decimeters. If we use cement bricks with a side length of 4 decimeters instead

The pavement of a sidewalk needs 80 pieces of cement bricks with a side length of 3 decimeters. How many pieces of cement bricks with a side length of 4 decimeters There must be a formula The pavement of a sidewalk needs 80 pieces of cement bricks with a side length of 3 decimeters. If we use cement bricks with a side length of 4 decimeters instead

Pedestrian pavement area = 3 * 3 * 80 = 720 square decimeters
4 decimeter cement brick: 720 / (4 * 4) = 720 / 16 = 45 pieces

A sidewalk is 30 meters long and 4 meters wide. What is its area? If it is paved with 25 square decimeters of cement bricks, how many cement bricks are needed?
Tips 1 square meter to use a few pieces
Detailed steps

The area of sidewalk is 30 × 4 = 120 square meters
120 square meters = 12000 square decimeters
12000 △ 25 = 480 pieces
It needs 480 cement bricks with an area of 25 square decimeters

The sidewalk is 150 meters long and 50 decimeters wide. It needs to be paved with 30 square decimeters of cement bricks. How many cement bricks do you need to fill this sidewalk?

Analysis: 150 meters = 1500 decimeters, 1500 × 50 ／ 30, = 75000 ／ 30, = 2500 (pieces). Answer: 2500 cement bricks are needed to pave this sidewalk