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ACT Math Videos 161 videos

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ACT Math 5.2 Pre-Algebra 1939 Views


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Description:

ACT Math: Pre-Algebra Drill 5, Problem 2. If a and b are prime numbers, how many factors does ab have?

Language:
English Language

Transcript

00:03

Can't we all just shmoop along?

00:06

If a and b are prime numbers, how many factors does ab have?

00:10

And here are the potential answers...

00:15

This is less of a problem and more... theory. Well... theory shmeory.

00:20

To solve these problems, we can just plug in real numbers and see what happens.

00:24

So like... let's say a is 2 and b is 3... both prime numbers.

00:31

a times b is 6, which has 4 factors: 1 and 6, but also 2 and 3.

00:36

So there are... 4.

00:38

We could try the same with a few other pairs of prime numbers, but we're always going

00:41

to arrive at the same answer.

00:43

Which is what makes math so lovely.

00:45

Answer D.

00:46

As in, "Dazzling good looks."

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