How many circles of radius 1 can fit into circle of radius 500?

using 3.14 for Pi, since you didn't say what value to use

area = PI x r^2

Area of larger circle = 3.14 x 500^2 = 785,000 square units

area of smaller circles = 3.14 x 1^2 = 3.14 square units

785,000 / 3.14 = 250,000 small circles can fit into larger one