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ACT Math: Pre-Algebra Drill 5, Problem 2. If a and b are prime numbers, how many factors does ab have?
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ACT Math 5.2 Pre-Algebra 1938 Views
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ACT Math: Pre-Algebra Drill 5, Problem 2. If a and b are prime numbers, how many factors does ab have?
ACT Math: Pre-Algebra Drill 5, Problem 2. If a and b are prime numbers, how many factors does ab have?
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.
Full Transcript
- 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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