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Question

Jill and Caitlyn are trying to set up an expression to help them solve a problem that asks for a value that is 25% off of a value, n. Jill tells Caitlyn that the way to solve this is to multiply n by 0.75, but Caitlyn wants to multiply 0.25 by n.

Part A: Can both Jill and Caitlyn come up with the correct answer, starting with different multiplication steps? 

 

Part B: Explain how each girl can either come up with the correct answer, or what mistakes they made that will give them an incorrect answer. 

Answer 1

n - .25n = (1-.25)n = .75n

25% off is the same as 75% of n

= n -25% of n

they're both right