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Numbers and Operations Videos 63 videos

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

SAT Math 1.2 Numbers and Operations
219 Views

SAT Math: Numbers and Operations Drill 1, Problem 2. If the masterpiece will be worth $45,055 in five years, what is its worth now?

SAT Math 1.3 Numbers and Operations
190 Views

SAT Math 1.3 Numbers and Operations. x and y must be which of the following?

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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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