grade 7 Math Review paper

A St. Louis Cardinals hat costs $18.  If there is 8% sales tax, what is the total cost of the hat including tax?

• $1.44

• $22.74

• $21.36

• $19.44

Answer explanation

To find the total cost including tax, first calculate the tax amount: $18 * 0.08 = $1.44. Add the tax to the original price: $18 + $1.44 = $19.44. Therefore, the total cost of the hat including tax is $19.44.

20% of the students in Mr. Royal's classroom are 12 years old.  If there are 15 students in the classroom, how many students are 12 years old? 

• 2

• 3

• 4

• 5

Answer explanation

20% of 15 students is 3 students, so there are 3 students who are 12 years old in Mr. Royal's classroom.

You borrowed $28 from your parents to buy a new video game, and they set a interest rate of 15% per month. How much interest do you owe in one month?

• $5.60

• $4.20

• $2.80

• $3.75

Answer explanation

To calculate the interest, multiply the borrowed amount ($28) by the interest rate (15% or 0.15), which equals $4.20. Therefore, you owe $4.20 in interest after one month.

The number of kids in a playground grew by 10% in thirty minutes.  If there are 77 kids in the park now, how many were there before?

• 70

• 71

• 72

Answer explanation

To find the number of kids before the increase, divide the current number by 1.10 (10% increase). 77 / 1.10 = 70, so there were 70 kids before.

What is 1% of $43?

• $0.43

• $4.30

• $0.043

• $43

Answer explanation

To find 1% of $43, you simply move the decimal point two places to the left, resulting in $0.43. Therefore, the correct answer is $0.43.

A new television costs £328 plus 20% VAT. What is the total cost of the TV?

• £393.60

• £360.80

• £348.00

• £382.60

Answer explanation

The total cost of the TV is £328 + 20% VAT, which equals £393.60. Therefore, the correct answer is £393.60.

A florist is told that 40% of the 350 flowers ordered must be red roses. How many red roses must be in the order?

• 390 roses

• 100 roses

• 140 roses

• 240 roses

Answer explanation

To find the number of red roses, multiply 40% of 350 flowers: 0.4 * 350 = 140 roses. Therefore, 140 red roses must be in the order.

The movie theater has 250 seats. 225 seats were sold for the current showing. What percent of seats are empty?

• 10%

• 20%

• 80%

• 90%

Answer explanation

To find the percentage of empty seats, subtract the sold seats (225) from total seats (250) to get 25 empty seats. Then, calculate (25/250) * 100 = 10%. Therefore, 10% of seats are empty.

Bill is in a class of 15 boys and 35 girls. 40% of the students in the class take the bus to school. How many students do not take the bus to school?

• 15

• 20

• 30

• 35

Answer explanation

40% of 50 students take the bus, which is 20 students. Therefore, 30 students do not take the bus to school (50 total students - 20 students who take the bus).

In the Central City Grand Prix, out of 30 cars that started the race, 12 of them finished. What percent of the cars finished the race?

• 20%

• 40%

• 60%

• 80%

Answer explanation

To find the percentage of cars that finished the race, divide the number of cars that finished (12) by the total number of cars that started (30), then multiply by 100. This gives 40%.