Math Review

Decimals

100

3.5 + 2.75 = 

6.25

200

8.4 x 0.6 =

5.04

300

15.75 / 2.5 =

6.3

400

A shirt costs $24.80 and is discounted by $6.75. What is the new price?

$18.05

Fractions

100

1/4 + 2/4 =

3/4

200

2/3 x 3/5 =

2/5

300

3/4 divided by 1/2

1 1/2

400

A recipe needs 2 1/2 cups of flours. You make 3/4 of the recipe. How much flour do you need?

1 7/8 cups

Percentages

100

What is 25% of 80?

20

200

18 is what percent of 60?

30%

300

A $50 item increases in price by 20%. What is the new price?

$60

400

A jacket is 30% off and costs $42 after the discount. What was the original price?

$60

Scientific Notation

100

Write 5,000 in Scientific Notation

5 x 10³

200

Write 0.00072 in Scientific Notation

7.2 x 10^-4

300

(3 x 10⁴) x (2 x 10²)

6 x 10⁶

400

(8 x 10⁷) x ( 2 x 10³)

4 x 10⁴

Challenge Question

500

A scientist measures a distance of 3.6 x 10⁴ meters. He completes 25% of the distance on Monday and 50% remaining distance on Tuesday. How many meters are left?

Convert: 3.6 x 10⁴ = 36,000

Monday: 36,000 x 25% = 9,000

Remaining: 36,000 - 9,000 = 27,000

Tuesday: 27,000 x 50% = 13,500

Final remaining: 27,000 - 13,500 = 13,500