7th Grade Math STAAR Review

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, you can cross multiply and then divide.

Front

What is the formula for finding a percentage of a total?

Back

Percentage = (Part/Total) x 100.

Front

How do you calculate percent of change?

Back

Percent of Change = ((New Value - Old Value) / Old Value) x 100.

Front

What is a variable in an equation?

Back

A variable is a symbol used to represent an unknown value.

Front

What does it mean to 'cross multiply' in a proportion?

Back

Cross multiplying means multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 7 out of 10 students have backpacks, how do you find the expected number of students with backpacks in a larger group?

Back

Set up a proportion: 7/10 = x/700, then cross multiply and solve for x.

Front

What is the total number of vegetable plants if 12% are green beans and there are 24 green beans?

Back

Total = 24 / 0.12 = 200.

Front

What equation can be used to find the number of quarters needed if you need $1.50 and already have $0.75?

Back

1.5 = 0.25q + 0.75.

Front

How do you find the price reduction percentage?

Back

Price Reduction Percentage = ((Old Price - New Price) / Old Price) x 100.