Proportionality. The student applies mathematical process standards to develop an understanding of proportional relationships in problem situations.

6.4.ACompare two rules verbally, numerically, graphically, and symbolically in the form of y = ax or y = x + a in order to differentiate between additive and multiplicative relationships.6.4.BApply qualitative and quantitative reasoning to solve prediction and comparison of real-world problems involving ratios and rates.6.4.CGive examples of ratios as multiplicative comparisons of two quantities describing the same attribute.6.4.DGive examples of rates as the comparison by division of two quantities having different attributes, including rates as quotients.6.4.ERepresent ratios and percents with concrete models, fractions, and decimals.6.4.FRepresent benchmark fractions and percents such as 1%, 10%, 25%, 33 1/3%, and multiples of these values using 10 by 10 grids, strip diagrams, number lines, and numbers.6.4.GGenerate equivalent forms of fractions, decimals, and percents using real-world problems, including problems that involve money.6.4.HConvert units within a measurement system, including the use of proportions and unit rates.
Example Problems
A laptop's price was discounted from to .

What is the
percent decrease in price?
A store raised the price of a notebook from to .

What is the
percent increase in price?
A gym increased its monthly membership fee from to .

What is the
percent increase in the fee?
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