Area of circle = πr²
Area of circle = π(4÷2)² = 12.57 cm²
If the number to the right to the number you are rounding higher than five add one to the number on the left all the numbers behind the eight turn into zeros the answer is 900,000
39 x 5 = (30 x 5) + (9 x 5) = 150 + 45 = 195
He did not change the sign of operation when 28 crossed the equals sign.
The side length of the cube is 6 cm.