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Addition and Subtraction Videos 7 videos

Word Problems with Addition and Subtraction
4464 Views

Sometimes, we just want fewer y's...or more x's. That's why it's great to know how to add and subtract variables. In real life, though, we try to a...

Addition and Subtraction of Double Digit Numbers with Carrying
332 Views

What's easy, simple, and comfortable? Adding and subtracting double digit numbers. What's not-so-easy, the opposite of simple, and definitely not c...

Addition and Subtraction of One Digit Numbers
2061 Views

What better way to teach simple addition and subtraction than with dress-up? Math skills will go great with that pink frilly number hanging in your...

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SAT Math 3.6 Numbers and Operations 208 Views


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Description:

SAT Math 3.6 Numbers and Operations

Language:
English Language

Transcript

00:02

Put this in your calculator and shmoop it...

00:05

If a + b = 12, b + c = 17, and a + c = 9, what is the value of a + b + c?

00:14

And here are the potential answers...

00:18

If we push our way through the annoying crowd of variables...

00:21

...we'll find that what this question is actually asking

00:24

is just for us to sum a, b, and c.

00:28

What if... we add up all three of the equations that are given to us?

00:32

In that case, we get a + b + b + c + a + c equals 12 + 17 + 9.

00:42

And if we combine all like terms...we get 2a + 2b + 2c equals 38.

00:52

Next, we can distribute the 2 to make the equation 2 times the quantity a + b + c... equals 38.

00:59

Divide both sides by 2, and our equation looks like this: a + b + c = 19.

01:04

Answer B.

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