Hello! I Am going to show you an example. 3+3 = 6. 6-3 = 3 If You Need To Know What is A Number Just Count The Smaller Number And Count Until You Get To The Bigger Number. Example:7- 14 Count 7 until you get 14 lets count. 8,9,10,11,12,13,14 so that is 7 and to double check 14 - 7 is 7! Thats All!! :D
If you have an equation like 3+x=6 then you use subtraction by subtracting 3 from 6 to get 3 thats how you get the value of x (x=3) then you can go back and plug it in 3+3=6