Grade 7 Math

Front

What is the total number of prizes that can be won if a player picks one of 5 doors and then one of 3 boxes behind that door, with each box containing a different prize?

Back

15 prizes (5 doors x 3 boxes = 15)

Front

If Mrs. Cheng has $22 deducted monthly for her gym membership, what is the total change in her account after one year?

Back

-$264 (22 x 12 = 264, and it's a deduction)

Front

A car travels 132 miles on 4 gallons of gas. How many gallons are needed to travel 231 miles at the same rate?

Back

7 gallons (231 miles / (132 miles / 4 gallons) = 7 gallons)

Front

If Olivia orders 6 ham sandwiches for a total of $30.72, how much does each sandwich cost?

Back

$5.12 ($30.72 / 6 = $5.12)

Front

What is the probability of drawing two striped marbles from a jar containing 3 green, 2 pink, and 4 striped marbles, if each marble is replaced after being drawn?

Back

16/81 (Probability of striped on first draw: 4/9, second draw: 4/9; (4/9) x (4/9) = 16/81)

Front

Define probability in the context of drawing marbles from a jar.

Back

Probability is the measure of the likelihood that an event will occur, calculated as the number of favorable outcomes divided by the total number of possible outcomes.

Front

What is the formula to calculate the total number of outcomes when making multiple choices?

Back

Total outcomes = (number of choices for first option) x (number of choices for second option) x ...

Front

How do you calculate the change in an account after monthly deductions?

Back

Change = monthly deduction amount x number of months (considering the sign for deduction as negative).

Front

What is the unit rate when given a distance and the amount of gas used?

Back

Unit rate = distance traveled / gallons of gas used.

Front

How do you find the cost per item when given the total cost and the number of items?

Back

Cost per item = total cost / number of items.