6.RP.3c Find a percent of a quantity as a rate per 100.
6.NS.3 Fluently add, subtract, multiply and divide multi-digit decimals using the standard algorithm for each operation.
7.RP.3 Use proportional relationships to solve multi-step ratio and percent problems.
7.NS Apply and extend previous understandings of operations with fractions to add, subtract, multiply and divide rational numbers.
Grades 6, 7