# Student Work for Decimal Ops Problem 4.1

Many people have learned to compute percents by learning an algorithm that may or may not make to sense them. In CMP, students are asked to make sense of various strategies to understand how and when percents are used to calculate amounts.

*Decimal Ops *Problem 4.1: What is the Tax on This Item? is a chance for students to develop understanding and skill in the use of percents to calculate taxes.

The examples of student work come from a CMP teacher. During the Summarize, she recorded the strategies her students used compute the tax on various items. These charts are then posted on the wall as a record of the student strategies.

These examples may help teachers anticipate the strategies that their own students might use to find the price of items when tax is charged and to adjust their planning accordingly.