Use mental math to guess the starting value for the table.
6
Practice makes perfect
We want to use a table to solve the given equation.
8a-10=38
In order to choose a good starting point for our table, let's pretend that the equation is 8a=38. What multiplied by 8 would get us close to 38? 4 or 5 would be equally valid, so let's try those. We should also try one digit less and one digit greater, just to be safe.
a
8a-10
=
3
8 (3)-10
14
4
8 (4)-10
22
5
8 (5)-10
30
6
8 (6)-10
38
We can see that a=6 is the solution to our equation.