One-Step Addition Equations
Solve x+5=12
x=7
Solve x−4=10
x =14
Solve 3x = 12.
x = 4
Solve x/2= 6.
x = 12
2x+3=11.
x = 4
Solve x+9=20.
x=11
Solve x−12=8.
x = 20
Solve 5x = 25.
x = 5
Solve x/5=7.
x = 35
Solve 3x−5=10.
x = 5
Solve x+15=30.
x=15
Solve x−25=40.
x = 65
Solve 8x=64.
x = 8
Solve x/8=9
x = 72
4x+7=23.
x = 4
Liam had 27 stickers. His friend gave him some more, and now he has 50 stickers. How many stickers did his friend give him?
(x + 27 = 50) x = 23
A shopkeeper had some apples. He sold 33 of them, and now he has 50 left. How many apples did he have before selling any?
(x – 33 = 50): x = 83
Each chair in a hall has 12 balloons tied to it. Altogether, there are 96 balloons. How many chairs are there?
(12x = 96): x = 8
A bakery made a large batch of cupcakes. They packed them into boxes of 12 each. If they ended up with 11 boxes, how many cupcakes did they bake in total?
(x ÷ 12 = 11) x = 132
A movie theatre charges 5 dollars per ticket, but you also get a 12‑dollar discount coupon. If you paid 28 dollars in total, how many tickets did you buy?
(5x – 12 = 28): x = 8
Maria has 42 marbles in her box. Her friend gives her some more marbles, and now she has 100 marbles in total. How many marbles did her friend give her?
(x + 42 = 100) x = 58
A farmer had some chickens. He sold 75 of them, and now he has 100 left. How many chickens did the farmer have before selling any?
(x – 75 = 100): x = 175
Each box of pencils contains 20 pencils. A school bought several boxes, and altogether they have 200 pencils. How many boxes did the school buy?
(20x = 200): x = 10
A bakery baked a large number of cookies. They packed the cookies into boxes of 25 each. If they ended up with 20 boxes, how many cookies did they bake in total?
(x ÷ 25 = 20): x = 500
A taxi company charges 15 baht as a starting fee plus 6 baht for every kilometre travelled. If a passenger paid 45 baht for the ride, how many kilometres did the passenger travel?
(6x + 15 = 45): x = 5