99×19=
To make it easier for us to solve, we will use the divisibility rule by 19:
Let's multiply 99 by each term in parentheses:
Let's solve the expression in the first parentheses:
We'll separate the expression in parentheses in a way that uses the divisibility rule by 99:
Let's multiply 9 by each term in parentheses and we get:
Let's solve each of the expressions in parentheses:
Let's solve the expression from left to right.
We'll solve the left expression by adding vertically:
We'll make sure to follow the correct order when solving the expression, ones with ones, tens with tens, and so on, and we get:
Now we get the expression: