200 Fdrfc
20x20
352 = 1225 = 1000 + 200 + 20 + 5
400
202 = (22*5)2 = 24*52 = 2*2*2*2*5*5
202 = 400400 in expanded notation is: (4 x 100) + (0 x 10) + (0 x 1)
20 squared = 400 = (4 x 100) + (0 x 10) + (0 x 1)
20 squared = 20 x 20 = 400 400 in expanded form using exponents = (4 x 10^2) + (0 x 10^1) + (0 x 10^0)
20 x 20.400
To write powers of a number you write the number, followed by the number of the power in superscript. For example, a number to the second power is x2, a number to the third power is x3 and so on. Squaring is taking a number to the second power. Thus 20 squared is 202, which equals 400.
20 squared = 20^2
20 squared is 20 x 20 or 400.