7th Grade Math Semester 1 Review

Front

What is the total cost of Lucy's purchases if she bought a box of bones for $5.99, a bag of dog food for $19.49, and a squeaky toy for $6.79?

Back

Total cost = $5.99 + $19.49 + $6.79 = $32.27.

Front

If Lucy gave the cashier $40, how much change should she get back after her purchases?

Back

Change = $40 - $32.27 = $7.73.

Front

What is the total cost of Jaycee's purchases including a 5% sales tax on strawberries for $3.50, carrots for $2.25, and a bouquet of flowers for $9.95?

Back

Total cost before tax = $3.50 + $2.25 + $9.95 = $15.70. Sales tax = 5% of $15.70 = $0.785. Total cost = $15.70 + $0.785 = $16.49.

Front

Back

Front

What is the discount percentage if a pair of shoes is marked down from $70 to $49?

Back

Discount = $70 - $49 = $21. Discount percentage = (21/70) * 100 = 30%.

Front

If a $110 pair of shoes has the same discount as the previous pair, what will be the sale price?

Back

Sale price = $110 - (30% of $110) = $110 - $33 = $77.

Front

How far does a train travel in 1.5 hours if it travels 40 kilometers in 16 minutes?

Back

Speed = 40 km / 16 min = 2.5 km/min. In 1.5 hours (90 min), distance = 2.5 km/min * 90 min = 225 km.

Front

What is the formula to calculate the total cost including tax?

Back

Total cost = Price + (Price * Tax Rate).

Front

How do you convert a fraction to a decimal?

Back

Divide the numerator by the denominator.

Front

What is the formula for calculating percentage discount?

Back

Percentage Discount = (Discount Amount / Original Price) * 100.