7th grade Math Review

Front

What is the total number of marbles in the bag?

Back

20 marbles (5 red + 6 blue + 3 green + 4 black + 2 yellow = 20)

Front

What is the probability of drawing a green or black marble from the bag?

Back

The probability is 9/20 or 0.45.

Front

If a marble is drawn 100 times, how many times would you expect to draw a green or black marble?

Back

35 times (0.45 * 100 = 35)

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr.

Front

If the circumference of a circle is 21.98 cm, what is the diameter?

Back

7 cm (d = C/π = 21.98/3.14)

Front

What is the constant of proportionality?

Back

It is the ratio between two proportional quantities.

Front

If Will spent $3.75 for 3 pounds of granola, what is the unit rate?

Back

$1.25 per pound.

Front

What is the formula for the area of a circle?

Back

A = πr².

Front

If the area of a circle is 78.5 m², what is the radius?

Back

5 m (A = πr², r = √(A/π) = √(78.5/3.14) = 5)

Front

What is the relationship between circumference and diameter?

Back

The circumference is π times the diameter.