Addition
Multiplication
100
x + 4 = 25
What is 21
100

9x = 27

What is 3

200
a + 13 = 10
What is -3
200

7x = 63

What is 9

300

n + 8 = 14

What is 6

300

5e = 400

What is 80

400

x + 36 = 100

What is 136

400

11x = 275

What is 25

500

27 = c + 27

What is 56

500

21y = 756

What is 36