Question

How to work out questions like these, in detail please

Answer 1

Let the missing number be x,

For the first question, the equation is as follows,
x - 13 = 29

Solve for x,
x - 13 + 13 = 29 + 13
x = 42

The equation would then be 42 - 13 = 29

For the second question, the equation is as follows,
x - 12 = 203

Solve for x,
x - 12 + 12 = 203 + 12
x = 215

The equation would then be 215 - 12 = 203

Answer 2

42-13=29 and

215-12=103

Hope this helped!!!