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PPT – Using the Inverse Operation PowerPoint presentation | free to download - id: 3d79d5-MDgxN

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Using the Inverse Operation

What is the inverse of multiplication?

Division

So we can use division to solve problems that

involve multiplication and multiplication to

solve problems with division

Example Isolate the variable

Do the inverse so divide by 3

Now check your answer!!

Checking your answer

X 4 so plug it back into the original problem

More examples

The opposite of Division is Multiplications so x

by 2

Remember what you do to one side you have to do

to the other

The two cancel so we are left with

Check your answer!!

Try these

Multiplying by the Reciprocal

So multiply both sides by the reciprocal

Try this one

Whenever we isolate a variable we are using the

properties of equality

Addition property of equality If a b then a

c bc Subtraction Property of equality If ab

then a c b - c Multiplication Property of

equality If ab then ac bc Division property of

equality If ab then a?c b ? c

What does it mean to be Similar?

- Similar figures are figures that have the same

shape, but not necessarily the same size. - Imagine that you have reduced or enlarged a

figure in a photocopy machine - the figure has

the same shape, but not the same size.

Corresponding Sides Angles

Ratios

We can use ratios as a way to compare

corresponding sides For example

Using ratios to find the missing Side

If two figures are similar their ratios are equal

So if I look at the last example

so

Now put in the numbers and using inverse

operations to solve

Now Solve for X

Example 1

Find the value for Y

Example 2

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