Write Numerical Expressions
The sum of 8 and 6
8 + 6
6 + 4 x 2
14
Write: Add 4 and 6, then multiply by 5
(4 + 6) x 5
or 5 x (4 + 6)
15 - 6
The difference of 15 and 6 or: Subtract 6 from 15
A math phrase with numbers and operation signs but NO equal sign
Numerical expression
add n and 7
n + 7
9 less than 20
20 - 9
30 - 12 ÷ 3
26
Evaluate: (12 -4) x 3
24
7 x 9
The product of 7 and 9
An equation, because it has an equal sign.
9 less than x
x - 9
multiply 7 and 4, then add 3
7 x 4 + 3
40 ÷ 5 x 2
16
Write: The difference of 20 and 8, divided by 4
( 20 - 8) ÷ 4
4 + 8 x 2
To find the value of an expression
Evaluate
The product of 6 an y
6y
Subtract 5 from the quotient of 36 and 4
36/4-5
25 - 9 + 3
19
Evaluate: (15 + 9) ÷ (8 - 2)
4
(12 + 3 ) ÷5
divide the sum of 12 and 3 by 5
The set of rules that tells which operation to do first
PEMDAS or Order of Operations
divide m by 4
m ÷ 4 or
m/4
Mia buys 3 packs of 8 pencils and 4 extra pencils. Write an expression for the pencils.
3 x 8 + 4
32 + 5 x 4
29
Write: Multiply the sum of 7 and 3 by the difference of 10 and 4
6 x (10 - 4)
Multiply 6 by the difference of 10 and 4
What does PEMDAS stand for?
Parentheses, Exponents, Multiplication and Division, Addition and Subtraction
Subtract k from 30
30 - k
Leo had 50 cards. He gave 2 cards to each of 9 friends, then lost 4. Write an expression for the cards he has left.
50 - 2 x 9 - 4 (=28)
23 x 3 - 12 ÷ 4
21
Evaluate: 2 x [20 - (3 + 5)]
24
20 - 18 ÷ 3
Subtract the quotient of 18 and 3 from 20
True or False: In PEMDAS you always multiply before you divide?
False
Twice the sum of a and 5
2 x (a + 5)
6 more than twice the product of 5 and 3
2 x (5x3) + 6
102 - 6 x 7 + 48 ÷ 8
64
Evaluate: {50 - [3 x (4 + 2)]} ÷4
8
(9 + 6) X (8 - 5)
Multiply the sum of 9 and 6 by the difference of 8 and 5
in 53, name the base, and the exponent. Then find the value.
5 is the base. 3 is the exponent. =125
n friends each buy a $6 ticket and a $2 snack. Write an expression for the total cost.
8n