# 7 shortcuts for solving fractions in record time

Welcome to MooMooMath Today we are going to

learn tricks with fractions. This video covers all 7

Trick number one,the criss cross method. This is an easy way to add two fractions without

working to hard to find a common denominator The first step is to multiply the denominators

together. 4×6=24 Now you will use what we call the “Criss-Cross Method” 6×3=18 and

4 x 1=4 . Add these together to get the numerator which equals 18+4=22 for the numerator.

Bring the 24 over and then you just reduces to 11/12 and that is our final answer. So

that is the criss- cross method for adding fractions. A con of this method is that it

is a shortcut and you are not learning the actual reasons for everything.

Let’s do a more traditional method of adding fractions. We will just multiply the denominator

which is 4×5=20 Now we will figure out our multiplies. I take 20 which is my new denominator

and divide it by the original denominator4 So 20 divided by 4=5 So the first fraction

I will multiply by 5 and the second fraction I will multiply by multiplier of 4.Once I

multiply by those my numbers my denominator becomes a 20,but my numerator becomes a 10

+ 12 and that becomes 22/20,which reduces to 11/10 or you can change this fraction to

a mixed number by dividing by 10 which equals 1 1/10. and this is my final answer as a mixed

number. Fraction trick number 3 KCF which is the Keep

it,Change it Flip it method. and you use this to divide fractions. Lets look at the two

fractions a/b divided by c/d You will now use Keep Change Flip to divide this fraction.

You will take the first fraction and keep it. That is what the K stands for. The C stands

for change and you will change from division to multiplication. The F stands for flip it,and

you take the reciprocal of the last fraction.and it becomes d/c. Now from here you just multiple

the fractions straight across and end up with ad/bc. Here is a quick example with numbers.

Take 1/2 divided by 3/4 I keep the 1/2.I change the division to multiplication,and I flip

the 3/4 to 4/3 I then multiply straight across and end up with 4/6 and reduce the answer

and end up with 2/3 To reduce the fraction I’m just dividing by a common factor 2. That

is how I use trick 3 Keep it Change it Flip it Rule.

Trick # 4 Knowing the lingo. We are going to learn some terms in fractions. What is

a vinculum? It

is the line between the numerator and your denominator. The top of the fraction is the

numerator and the bottom is the denominator,and the bar in the middle is a vinculum.Now you

know the word for that bar between the 2 numbers when you divide.

Trick 3 5 The Ladder Method This is very useful when you are given two

numbers and you are trying to find the greatest common factor (GCF) or the least common multiple

(LCM) Some people call this the cake method.Let’s take 16 and 24. I will draw a bar underneath.

A sideways L Next I will look for a prime factor that will divide evenly into both numbers.

2 will divide into both numbers and I get 8 and 12. Then draw a new line,and find a

prime factor that will divide into these two numbers. 2 goes again 2 goes into 8 4 times,and

goes into 12 6 times. Draw a new bar and find a new prime factor. 2 goes a third time 4

divided by 2 is 2 and goes into 6 3 times. I now do not have another prime factor. so

I put a 1. So what do I have left. On the left side I have multiple these prime numbers

together 2x2x2x1=8 and this is my greatest common factor. that divides both into 16 and

24. Now to find my LCM I will take the first list of prime numbers plus my remainder and

multiply all those numbers. 2x2x2x1x2x3=2×2=4 4×2=8 8×2=16 16×3=48 and that is my least common multiple (LCM)

Trick #6 This is called the circle method. It is used to turn a mixed number into an

improper fraction. We will start at the denominator and multiple in a circular direction. So I

will take 2×3 and multiply this first. I then will take this result and add the numerator.So

this will be 2×3=6 plus 1 is 7,which becomes my new numerator and I keep my denominator

a 2. The 31/2 becomes 7/2 42/3 3×4=12 and then add 2 which becomes

14/3 That is my circle trick to convert.

Trick # 7 Is just

to memorize. Try to be familiar with these 12 fractions and their decimal equivalents

you will have a good number sense of where numbers should fall between the value of 0

and and 1. So the best thing I can tell you is to get some flashcards,go on quizlet and

they may be on quizlet and become familiar with these fractions. 1/4=.25 The way I remember

the ones with a denominator of 4 is think of quarters If I 1 quarter I have 25 cents.

If I have 3 quarters I have 75 cents. A 1/2 is .50 or half a dollar. 1/5 is .20 because

it takes 5 twenty’s to make whole. Now the thirds fall in another family. 1/3=.333

repeating.but 2/3=,333 doubles which is .666 repeating. 3/5 is just adding .20 to

2/5 and add .20 to 3/5 and get .80 . We are adding .20 each time. The 8ths are a little

tricky to remember. 1/8 is .125 and 3/8=.375 5/8=.625 and 7/8=.875 These are the trickiest

to remember. Get comfortable with these. Try to write the patterns and write these fractions

down and improve your number sense. This helps and when you see a whole number like 5.375

you know that is really 5 3/8 Those are your 7 fraction tricks to remember.

Hope this video helped.

This helped me so much thank you!

i think its bow tie method not criss-cross

thank you very helpful. helped me teaching kids at home. please make more math tutorials. god bless

This really helped my child

Ty @

It really help me teach my kid

thanks

I really need it

good

for the KCF do u have to change division to multiplication, or can you change it to addition or subtraction?

I love math please do more videos about math for 4 grade because I have a test about this

a really wanted it

I like how there are different "tricks" to calculate the correct answer. These strategies can help individuals solve when working with fractions.

does it work for

Okay but for me the second one is confusing

AMAZING .. REALLY AMAZING ..

good your like a teacher or your a teacher

Those dislikes are teachers

KCF or KFC? Sounds delicious

Thanks ! it was really helpful π

Good

You teach better than my teacher

Lol!! 2/3=0.666~ omg!!! Its 666!!π

I have an exam tomorrow thanks

Very very good for about childrens it is very useful tips

1 plus 1 : 100 like if you understand

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I love it

Thanks for taking the time to share this video

Every time I look at a fraction, I get so stressed because I'm horrible at solving them lol

you are fat

Explanation is simple and easy to understand, I hope all teacher's in mathematics are like this, so it won't be so complicated.

She has dyslexia

Handwriting!!!! Ahhh OCD here

I FOUND ALOT OF USEFUL TUPS AND TRICKS

looks attractive but not

In the first math problem you can just add the 3 and 1 and multiply the denominators, the problem is that it wont be the lowest possible denominator.

Thanks I just needed a little study session for my test tommorow

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Thanks Mom!

I was following u n doing good n then u did the 666 problem and Threw me all off! π€―

This didnt help meπ

Wow the one with the mixed fraction is great! Iβll use that!

trash

Awesome! Thanks

so helpful

nice

Smart

This is a traditional way to teach fractions. There are newer techniques and methods to teach them in an easier and friendly way. This method is not good for visual students.

This is not simple for someone who gets stressed out looking at fractions this isn't making it easy please simplify it slow down you know this stuff shoot I don't this was not helpful maybe for other people but not for me not happy

Do a live video . I'm having many questions.

This is wrong the first method

11:13 devil number o_o

How is 2x2x2x1 equal 8 or am I that dumb actually donβt answer that itβs a rhetorical question I thought it was 6 and then x the 1 equal 6! Ugh I hate math

You are my favourite teacher

Is trick for playing soccer.

Be like Cristiano Ronaldo

Exam 100% pass wohoo

Thx internet..I love my teen gen

Is that decreases

did anyone ave it where the first mehod wasnt correct

Trick 2 is just Trick 1 but complicated…