Writing Expressions
Fern has 7 red pens and b blue pens. Write an expression to show how many pens Fern has in all.
7 + b or b + 7
4 + 2 x 3 - 8
2
18 + x = 36
x = 18
25y
Expression
A(n) _________________ is an unknown part of an equation, represented by a letter.
What is a variable?
Sarah had 15 quarters. She used q quarters in the vending machine. Write an expression to show how many quarters Sarah has left.
15 - q
12 - (8 +2) + 4
6
x - 45 = 15
x = 60
145t + 3
Expression
A mathematical statement that can often be simplified.
What is an expression?
Macy had d dollars. She gave half of her dollars to charity. Write an expression to show how many dollars Macy gave to charity.
1/2d or d divided by 2
4 x 3 - 2 + 8 x 3
34
x/3 = 10
x = 30
19f = 63
Equation
Two expressions set equal to each other creates a(n) _______________.
What is an equation?
A candy company divided c bags of candy into 12 boxes. Write an expression to show how many bags of candy are in each box.
c divided by 12 or c/12
14 + (8 - 2 x 3) - 6 + 12
22
15x = 75
x = 5
7(1/2 + r)
Expression
Numbers that have exactly two factors.
What are prime numbers?
Write an expression to represent.......
five times the sum of 4 and t
5(4 + t)
5(4 - 2) + 18 - (4 x 3)
16
x/7 - 4 = 3
x = 49
34v - 17 = 12u + 87
Equation
The answer to a subtraction problem is a(n) ______________.
What is the difference?