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SAT Math Videos 171 videos

SAT Math 1.1 Algebra and Functions
315 Views

SAT Math 1.1 Algebra and Functions. Find an algebraic equation to correspond with the data.

SAT Math 1.1 Geometry and Measurement
719 Views

SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?

SAT Math 1.1 Numbers and Operations
280 Views

SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?

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SAT Math 4.3 Numbers and Operations 2174 Views


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Description:

SAT Math 4.3 Numbers and Operations

Language:
English Language

Transcript

00:02

Getting' Shmoopy with it...

00:04

If a and b are different prime numbers, which

00:06

of the following could also be prime?

00:08

And here are the potential answers...

00:13

The best way to deal with these questions

00:15

is to substitute real prime numbers for the variables.

00:20

Let's say a = 2 and b = 3.

00:24

Now we can test each answer choice.

00:27

Choice A: 2 times 3 is 6. 6 is not prime. Boom -- gone.

00:32

Choice B: 2 cubed is 8. 8 isn't prime. Outta here.

00:37

Choice C: 2 plus 3 is 5. 5 is prime.

00:42

Choice D: 3 squared is 9. 9 isn't prime.

00:46

Only choice C can give us a prime number... ...so that's our answer.

00:57

An answer choice by any other letter would smell as sweet...

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