Addition
7 + 18
25
24-9
15
3 x 6
18
2x + 2 = 18
8
2x = 16 ——> x=8
A class has 28 students. Thirteen (13) students are girls. How many students are boys?
15 students
(28-13)
4 + x = 16
12
Y-5 = -14
-9
8x=24
3
4y -7 = 5
y= 3
(4y=12 —-> y=3)
A farmer has 15 cows, 12 horses, 25 sheep and 2 dogs How many animals does he have in total
54 animals
15 + 12 + 25 + 2 = 54
Y+1 = -3
0 - x = -11
11
22x = 66
3
X2 + 1 = 50
7
(x2 = 49 ——> x= +/- 7
A spider has 8 legs. How many legs do 9 spiders have?
72 legs (8x9)
22 + x = 5
- 17
(x= 5-22)
7- a = 9
-2
7- (-2) —-> 7+ 2 = 9
(-10)2
100
(-10) x (-10) = + 100
9n + 1 = 100
11
9n = 99
n = 11
Yesterday I drove to a city 8 kilometers away. Today I drove to a city 26 kilometers away. How many more kilometers did I drive today than yesterday?
18 kilometers
(26-8)
p - 4 = -30
- 26
p = -30 +4
-4 - w = -8
4
-w= -4 —> w=4
X3= 27
3
3 x 3 x 3 = 27
8(x-3) = 48
9
Your brother earned $6 less than you. If you both earned a total of $60, how much did your brother earn?
21
x= youx - 6 = your brother
X + x-6 = 60
2x - 6 = 60
2x= 54
X= 27
X-6 = 21