One-Step Equations (+)
a + 3 = 8
x=5
a - 5 = 4
a=9
Ms. Way gave the class an assignment, but 9 students did not have a pencil to write with because they only had snacks in their backpacks. After giving them pencils to borrow, she had 15 pencils left. How many pencils did Ms. Way start with?
Write an equation, then solve.
p - 9 = 15
p = 24
(Any variable is fine)
Give me an example of a variable.
any letter
12 = 5 + x
x=4
23 = x - 7
x = 30
Ms. Way brought 21 chocolates for her greedy students to share because they're always hungry. She forgot some students and ended up bringing 6 less chocolates than she really needed. How many chocolates was she supposed to bring?
Write an equation, then solve.
c - 6 = 21
c = 27
(Any variable is fine)
Define inverse operation
The opposite, signs that undo each other.
-18 + x = 42
x = 60
y - 74 = 59
a = 133
Ms. Way came in another day and the students had brought their own snacks -- chips, candy, and everything except their school supplies. She counted 252 snacks in total that day, which was 23 more snacks than she counted yesterday. How many snacks did she count yesterday?
Write an equation, then solve.
s + 23 = 252
s = 229
(Any variable is fine)
What is the inverse operation of addition?
Subtraction
-103 = -28 + h
h = -75
-43 = g - 38
g = -5
Ms. Way caught a student playing Block Blast in class, and they had beat her high score by 7,823 more points. If Ms. Way's high score is 12,347 then what is the student's high score?
Write an equation, then solve.
s = 12,347 + 7,823
s = 20, 170
Name the 4 operations.
Addition, Subtraction, Multiplication, and Division
f + 22 = -46
f = -68
h - 74 = -52
h = 22
A student in Ms. Way's class wasn't paying attention to the lesson and ended up losing 15 points on the assignment for the day as a penalty. If the student's final score ended up being -7 points, what did they score on the assignment before Ms. Way took away points?
Write an equation, then solve.
p -15 = -7
p = 8
What can you do to check your answer when solving?
Plug your answer into the original equation.