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?

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

To beautify the campus environment of a primary school, a sidewalk is paved with colored cement bricks. It needs 3600 square bricks with a side length of 2 decimeters. If it is replaced with 3 decimeters of square bricks
How much do you need?

3600×（2×2）÷（3×3）
=3600×4×9
=1600 yuan
Pavement area unchanged

A sidewalk is 150 meters long and 3 meters wide. It is paved with square cement bricks with an area of 9 square decimeters. How many cement bricks do you need

3x150 = 450 square meters = 45000 square decimeters 45000 / 9 = 5000 pieces