F.O.I.L
First, outer, inner, and last.
(n - 1) (n - 10)
Chat with our AI personalities
10 + 10 + 10 + 5 + 5 +1 = 41.
10 X 10 = 100 You can do this four ways: You can do it mentally in your head or you can add them all up on paper by lining up the numbers correctly with each other. You can use a calculator and that is the easiest way. An alternate way is to multiply 10 by 10.
10 + 10 + 10 = 30
18 + 10 + 28 + 10 = 66
A plus