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Question and Answer
Topic 8
Numerical Expressions, Patterns, and Relationships
Mrs. Flynn
The following slides review the key concepts in Topic 8.
325 + N = 26 is an algebraic equation.
325 + N = 26 is an algebraic equation
because it has an equal sign and a variable.
What is 9p – 44 considered?
9p – 44 is an algebraic expression because it is a
mathematical phrase that has at least one
variable and one operation.
An expression doesn’t have an equal sign.
I am a quantity (number) that can change (or
vary) and I am often represented as a letter
of the alphabet. What am I?
9x + 5
The variable is _____.
7b – 42 The variable is _____.
r÷8
The variable is _____.
Rachel sold 14 cupcakes during the first hour of the
bake sale and 9 cupcakes the second hour. What
expression shows the number of cupcakes she has
left?
C – 14 – 9
C -14 + 9
14 + 9 – C
C – (14 x 1) – (9 x 2)
C – (14 – 9)
Match the word phrase to the algebraic
expression:
15 divided by a number r
5g - 4
7 times the difference of y and 4
9x + 5
5 more than the product of 9 and x
15 ÷ r
The difference between a number b and 25
7 (y – 4)
4 less than 5 times a number g
b - 25
How do you evaluate a numerical
expression with more than one operation?
The order of operations states that operations in
parentheses are solved first, then exponents,
followed by multiplication and division from left
to right, Finally, addition and subtraction are
completed from left to right.
Please excuse my dear Aunt Sally.
Evaluate the numerical expressions
using Order of Operations:
6 + 27 ÷ 3
56
6 (14 – 7)
36
8x6–4x3
15
8 x (3 + 2) - 6
42
(3 + 2²) x (3 + 5)
34