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Multiplying with Cross Cancelling

Multiplying with Cross Cancelling

Assessment

Presentation

Mathematics

4th - 5th Grade

Hard

Created by

Joseph Anderson

FREE Resource

8 Slides • 7 Questions

1

Multiplying Fractions

How do we do it?

Slide image

2

First off it is much easier...

  • Multiply tops

  • Multiply bottoms

  • Simplify

3

It looks easier right...

If you know your multiplication facts...

4

One more trick to make it easier...

Make sure you know how to cross cancel the fraction when multiplying

5

Let's do a quick review!

Do this kahoot...

6

Ok... first practice problem...

Do this multiplication

 34×12\frac{3}{4}\times\frac{1}{2}  

7

Multiple Choice

What is 3 x 1?

1

3

2

4

3

2.65

4

I don't know

8

Multiple Choice

What is 4 x 2?

1

I dont' know

2

6

3

12

4

8

9

So now we have....

 38\frac{3}{8}  

Can we simplify it?

10

Multiple Choice

Can we simplify 3/8?

1

Yes

2

No

3

Maybe

4

Not sure

11

Now for brute force repetition...

12

Multiple Choice

What is this...

3846=\frac{3}{8}\cdot\frac{4}{6}=  

1

34\frac{3}{4}  

2

4

3

14\frac{1}{4}  

4

8

13

Multiple Choice

What is this...

3262=\frac{3}{2}\cdot\frac{6}{2}=  

1

92\frac{9}{2}  

2

18

3

14

4

13\frac{1}{3}  

14

Multiple Choice

What is this...

5665=\frac{5}{6}\cdot\frac{6}{5}=  

1

0

2

1

3

11

4

I am confused

15

Poll

How do you feel?

Great

So so

Not so good

Completely confused

Multiplying Fractions

How do we do it?

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