Writing Expressions
Fern has 7 red pens and b blue pens. How many pens does Fern have?
7 + b
The sum of 13 and 6x is equal to 15.
13 + 6x = 15
18 + x = 36
x = 18
x + 7 < 8
x < 1
A _________________ is an unknown part of an equation, represented by a letter.
variable
Sarah had 15 quarters. She used q quarters in the vending machine. How many quarters does Sarah have left?
15 - q
Felicia and Sam sold 103 muffins at the bake sale. Felicia sold 25 muffins. How many muffins did Sam sell at the bake sale?
"25 + s = 103" or
"s + 25 = 103" or
"103 - 25 = s" or
"103 - s = 25"
x - 45 = 88
x = 133
4x > 24
x > 6
Two expressions set equal to each other creates a(n) _______________.
equation
A bunch of bananas contains b bananas. If each banana weighs 150 grams, how much does the whole bunch weigh?
150b
Roger bought some used CDs at a garage sale. He gave 9 CDs to his dad and kept 12 of them for himself. How many CDs did Roger buy at the garage sale?
"c - 9 = 12" or
"c - 12 = 9" or
"9 + 12 = c" or
"12 + 9 = c"
x/7 - 4 = 3
x = 49
x - 12 < -4
x < 8
a mathematical expression where the two sides are not equal is called an ______________.
inequality
A candy company divided c bags of candy into 12 boxes. How many bags of candy are in each box?
c/12
Alison took 51 candy bars and split them into groups to give out for Halloween. She put 3 bars in each group. How many bunches did Alison make?
"51/3 = b" or
"51/b = 3" or
"3b = 51"
15x - 3 = 57
x = 4
-8x > 32
x < -4
A(n) ________________ is a combination of numbers, variables, and symbols that illustrate a mathematical relationship
expression
Macy had d dollars. She gave half of her dollars to charity. Then she gave 2 more dollars. How many dollars did she give to charity?
1/2 d + 2
Francine walked 44 miles last month on her days off. She walked 4 miles each time. How many days d did Francine have off?
"4d = 44" or
"44/4 = d" or
"44/d = 4"
3x + 10 = 25
x = 5
9 < 2 + (-x)
-7 > x
Each group of variables and numbers, separated by addition and subtraction signs, is called a _____________ of the equation.
term