This formative is by Kelly Quinn! Below, she describes how each 6th grade Common Core standard is assessed in it so you can see how it fits into what you are already teaching!
CCSS.MATH.CONTENT.6.RP.A.3.C Find a percent of a quantity as a rate per 100 (e.g., 30% of a quantity means 30/100 times the quantity); solve problems involving finding the whole, given a part and the percent.
Students are asked a multiple choice question to recognize which value, given in fraction or ratio form, is not equivalent to 20%.
Which is not equal to 20%