Q 01/05

In the expression 2 + 3 × 4, which operation do you do first?

A) The addition

B) Whichever is on the left

C) The multiplication

D) Either one, the answer is the same

Answer · why

C) The multiplication

Multiplication ranks above addition, so the answer is 14, not 20.

Q 02/05

What is (2 + 3) × 4?

A) 8

B) 12

C) 14

D) 20

Answer · why

D) 20

The parentheses force the addition to happen first: 5 × 4 = 20.

Q 03/05

A bowl holds 8 oranges and 6 lemons. What is the ratio of oranges to lemons in simplest form?

A) 4:3

B) 3:4

C) 8:6

D) 4:7

Answer · why

A) 4:3

Divide both parts of 8:6 by 2; the ratio of oranges to all the fruit would be 8:14, or 4:7.

Q 04/05

A statement that two ratios are equal, such as 6:8 = 3:4, is called what?

A) A percentage

B) A product

C) A proportion

D) A permutation

Answer · why

C) A proportion

Solving proportions is how you scale a recipe up or read a map.

Q 05/05

The word 'percent' literally means 'by' what number?

A) Ten

B) One hundred

C) One thousand

D) Twelve

Answer · why

B) One hundred

So 45% is the fraction 45/100, or 0.45 as a decimal.