STAAR math grade 7 (2021)

Front

What is the formula to calculate the percentage of a part compared to the whole?

Back

Percentage = (Part / Whole) × 100

Front

If Alberto’s monthly income is $3,200 and he spends $1,280 on rent and groceries, what percentage of his income is that?

Back

40% (1,280 / 3,200 × 100 = 40%)

Front

What is a scale drawing?

Back

A scale drawing is a representation of an object that is proportionally reduced or enlarged to a specific scale.

Front

If a building is 125 meters tall and 80 meters long, and the height on a scale drawing is 25 cm, how do you find the length on the scale drawing?

Back

Use the ratio of the actual height to the scale height to find the scale length: (125 m / 25 cm) = (80 m / x cm) => x = 16 cm.

Front

What is experimental probability?

Back

Experimental probability is the likelihood of an event occurring based on the results of an experiment.

Front

If Marco rolled two number cubes and got a 2 on one and a 4 on the other, how do you calculate the experimental probability of this outcome?

Back

Count the number of times the outcome occurs and divide by the total number of trials.

Front

What is a reasonable prediction based on data?

Back

A reasonable prediction uses existing data to forecast future outcomes.

Front

If 200 visitors are expected at a park, how can you predict the number of visitors who prefer a certain activity?

Back

Use the ratio of past visitors who preferred that activity to estimate the number for the new group.

Front

What is a linear equation?

Back

A linear equation is an equation that makes a straight line when graphed, typically in the form y = mx + b.

Front

How can you express the total number of coins in George’s collection after x months?

Back

y = 20x + 75, where y is the total number of coins and x is the number of months.