8: Advanced Proportional - Proportions and Ratios

 

Students at the Advanced Proportional stage are learning to select from a repertoire of part-whole strategies to solve and estimate the answers to problems involving fractions, proportions, and ratios. These strategies are based on finding common factors and include strategies for the multiplication of decimals and the calculation of percentages.

15:18:21 = 10:?:?
70 is what percentage of 42?
Two thirds of four fifths of x is 200.