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Writing expressions with variables and parentheses
Description
Exercise Name: Writing expressions with variables and parentheses
Math Missions: 6th grade (U.S.) Math Mission, Algebra I Math Mission, Mathematics II Math Mission
Types of Problems: 1

The Writing expressions with variables and parentheses exercise appears under the 6th grade (U.S.) Math Mission, Algebra I Math Mission and Mathematics II Math Mission. This exercise translates English into mathematical expressions.

## Types of Problems

There is one type of problem in this exercise:

1. Select the expression: This problem provides an English sentence involving mathematical operations, numbers and variables. The student is asked to select the correct answer from a multiple choice list.

## Strategies

This exercise is medium to get accuracy badges because reading the order of the numbers can be subtle. Speed badges are easy because it is possible to locate key phrases to help with selection of the correct answer.

1. All operations appear to be used often in these problems.

## Real-life Applications

1. Work problems often ask us to calculate how long it will take different people working at different speeds to finish a task. The algebraic models of such situations often involve rational equations derived from the work formula,$W = rt$. The amount of work done (W) is the product of the rate of work (r) and the time spent working (t). The work formula has 3 versions:
$W = rt$
$t = \frac{W}{r}$
$r = \frac{W}{t}$