If you divide a fraction over a number, you can just muplitply the denominator (the number under the line) by the number by which you divide:
99 and 21 are divisible by 3, so we can divide them both by it:
but that's all we can do!
so let's multiply
and it's its simplest form
99 and 21 are divisible by 3, so we can divide them both by it:
but that's all we can do!
so let's multiply
and it's its simplest form