## Algebra 1: Common Core (15th Edition)

There are 2.54 cm in 1 inch. To find the number of square centimeters in a square inch, square 2.54. $2.54^{2}=6.4516$ To get the number of square inches in 129 square centimeters, divide 129 by the number of square centimeters in 1 inch (6.4516). $129\div 6.4515\approx 20$