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Numbers and Operations Videos 63 videos

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?

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 4.5 Numbers and Operations 203 Views


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Description:

SAT Math 4.5 Numbers and Operations

Language:
English Language

Transcript

00:02

And here's an unshmoopy question you may find on an exam somewhere in life...

00:05

When a certain positive number is divided by 5 the remainder is 1.

00:09

When it is divided by 8, the remainder is 4.

00:11

What is the smallest possible value of this number?

00:15

And here are the potential answers...

00:20

The best way to find the answer is to just guess and check, using logic.

00:25

Since we want the smallest possible answer, let's start with the smallest answer choice

00:29

and work our way up until we find the right one.

00:31

We'll first start with Choice A first.

00:34

When divided by 5, 16 does leave a remainder of 1, but 16 is divisible by 8.

00:39

So Choice A gets the axe.

00:42

Time for Choice B's audition.

00:44

21 fits the first criterion, but when divided by 8, it has a remainder of 5.

00:50

Choice C is next. We see right away that 24 is a multiply of 8...

00:57

Now Choice D. 34 has a remainder of 4 when divided by 5

01:01

and a remainder of 2 when divided by 8.

01:03

Nope.

01:04

Now we only have one candidate left.

01:06

36 has a remainder of 1 when divided by 5 and a remainder of 4 when divided by 8.

01:12

Choice E is the correct answer.

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