Basic Mathematical Expressions

Write an inequality for the following: 5 less than twice some number is more than 15

• 5 - 2x > 15

• 5 - 2x < 15

• 2x - 5 < 15

• 2x - 5 > 15

Identify the correct order of operations for this expression: 42 × 10 - 72 ÷ 8

• multiplication, division, subtraction

• multiplication, subtraction division

• subtraction, multiplication, division

• division, multiplication, subtraction

Evaluate: 17 - 5 × 4 ÷ 2

Mathematical Equivalence

OFF

Evaluate: 15 + 7 × 2 – 11 + 35

Mathematical Equivalence

ON

Evaluate: 18 ÷ 2 × 3 – 17

Mathematical Equivalence

ON

Evaluate: 15 ÷ 3 × 2 + 9 ÷ 3

Mathematical Equivalence

ON

Evaluate: 4 + 3 × 3 + 8 ÷ 4

Mathematical Equivalence

ON

Addition ALWAYS comes before subtraction.

• True

• False

Answer explanation

The statement in the question is false. In mathematics, the order of operations, often remembered by the acronym PEMDAS, dictates that operations should be performed in the following order: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right). So, addition does not always come before subtraction.

What does PEMDAS mean?

a

b

c

d

e

f

÷

@

exponents

+

#

( )

-

%

×

&

True or false:
Multiplication ALWAYS comes before division.

• True

• False