One-step Addition Equations
What is the inverse operation of addition?
subtraction
What is the inverse operation of subtraction?
addition
What is the inverse operation of multiplication?
division
What is the inverse operation of division?
multiplication
The Walters traveled 182 miles in 3 1/2 hours. The equation 3.5m = 182 can be used to find their speed. What is their speed?
The Walters' speed was 52 miles per hour.
Which is a solution for the equation x + 83 = 179?
A. x = 86
B. x = 93
C. x = 96
D. x = 99
C. x = 96
96 + 83 = 179
Is y = 21 a solution for y - 17 = 38?
No
21 - 17 does not equal 38
y=55
Which is a solution to 4n = 356?
A. n = 74
B. n = 79
C. n = 84
D. n = 89
D. n = 89
Is d=108 a solution for m ÷ 12 = 9?
Yes!
108 ÷ 12 = 9
Nick wants to buy a skateboard that costs $85. He has already saved $15. Which equation represents the amount of money Nick still needs to buy the skateboard?
A. t - 15 = 85
B. t + 15 = 85
C. 15t = 85
D. t ÷ 15 = 85
B. t + 15 = 85
Solve for x. x + 49 = 400
400 - 49 = 351
x = 351
Solve for m.
m - 27 = 66
m = 93
66 + 27 = 93
Solve for v.
3v = 270
v = 90
270 divided by 3 = 90
Solve for x.
x/8 = 84
x = 672
84 x 8 = 672
To win the annual read-a-thon at her school, Trudy has to read more books than any of her classmates over winter break. She starts by reading a lot of sports books. Then, she reads 7 mystery books. In all, Trudy reads 25 books for the read-a-thon. Which equation can you use to find the number of sports books n Trudy reads?
A. n + 7 = 25
B. n - 7 = 25
C. 7n = 25
D. n/7 =25
A. n + 7 = 25
Solve for x.
x + 3.1 = 38
x = 34.9
38 - 3.1 = 34.9
You can rewrite 38 as 38.0 to line up the decimal point with the 3.1 before you subtract.
Solve for x.
x - 2/5 = 5/8
x = 1 1/40
5/8 + 2/5
You need a common denominator when adding fractions! The common denominator is 40.
25/40 + 16/40
41/40
Change the improper fraction to a mixed number.
1 1/40
Solve for d. 5.6d = 840
d = 150
840 divided by 56 = 150
Solve for x.
x ÷ 1/3 = 2/5
x = 2/15
2/5 x 3/1
2/15
Troy's age is 3 less than Paula's age, p. Troy is 11 years old. Which equation could be used to find Paula's age?
A. p + 3 = 11
B. p - 3 = 11
C. 3p = 11
D. p ÷ 3 = 11
B. p - 3 = 11
Solve for x.
x + 1/4 = 3/4
x = 1/2
3/4 - 1/4 = 2/4
Solve for x.
5.82 = x - 3.11
x = 8.93
Solve for x.
2/3 x = 6
x=9
Solve for x.
x ÷ 0.9 = 8.02
x = 7.218
Davon is saving his allowance to purchase a telescope. The telescope costs $84. If he saves $7 each week, which of the following equations can be used to find the number of weeks, w, it takes Davon to save up for the telescope?
A. w + 7 = 84
B. w - 7 = 84
C. 7w = 84
D. w ÷ 7 = 84
C. 7w=84