Nice Day Updated

Which one is the numerator and which one is the denominator? A common question, answered easily by "Have a Nice Day." N, D - Nice Day, Numerator, Denominator.

Here are a few more... ND - No Date

ND - No Dice

ND - Nice Dog

ND - North Dakota

ND - Nice Dangle (Hockey players will get this one.)

Dividing Fractions #%$^&*() Don't choke!!!!!!!!!!!!!!!!!

Dividing fractions? Don't choke!!!!!!!!!!!!!!!!!

Isn't one of the fractions supposed to be flipped around or something? I can never remember which one...

Here's the easy way to remember the process...

(Note - you are under no obligation to use this simple and easy to remember explanation. You can use any unnecessarily long and convoluted method you wish to help explain it.)

So what is 6/31  divided by 2/3?

Here's dad and son. Dad is 6 feet tall and aged 31. Dad is first in age so he's the first fraction.

Son is 2 feet tall and aged 3 months. Son is second.

Son starts to choke...

Dad, being dad, starts to swear. (He never swore much before the had children.) Swearing is bad (apparently), so we cross this out. Son gets turned upside down and becomes 3/2. Choking stopped!


So now we have 6/31  X   3/2

Solve as you would a normal fraction multiplication question. Remember....

Leave the first fraction alone. The guy is trying to save his son's life, here, people, so leave him alone to get on with the job. Please disperse. Back away from the man. Go about your business.

Turn the 2nd fraction upside down.

Put an X between your two fractions.

Solve as you would a normal fraction multiplication question.



Work smart, not hard.

Exponent Secrets

See this link           http://www.mathsisfun.com/activity/secret-safe-exponentially.html  for a great explanation of exponents.

! #@$%&#@#

Ever wonder what that...

or...

                                                                                                                                                                                  

           

               

                                                           X

...key is for on your calculator? Well...

That's your gold plated 

short cut to solving those "arrangement"-type questions. 

You know (and love) the ones - "You have one red, one green, one blue and one yellow circle. How many ways can you arrange these 4 circles?"

So you might set out to make a grid or chart, starting with red. 

1) ০০০০

2) ০০০০

3) ০০০০

etc., etc., until your crayons and patience are worn out.

Or you could just enter 4 on your calculator and then press the factorial (x!) key (you might have to press shift first, depending on your calculator.) Bang. Done. Work smart, not hard.

"3 out of 4" Questions - Rate and Proportion

This is a modification from an earlier post. I realised there might be a few Heavy Metal fans out there...fans of the band MUAADON.

"3 out of 4" Questions - Rate and Proportion

Look or sound familiar? 



"A 10 metre flag pole casts a shadow of 6 metres. A 12 metre pole would cast a shadow that is ______ metres in length."

"A motorcyclist rides 125 miles in 3 hours. At this rate, how much distance will be covered in 5 hours?"

A factory produces 3000 widgets every 45 minutes. How many widgets will be produced in 7 hours?


These questions, I like to call, are "3 out of 4" questions. You are given 3 numbers and you need to find the 4th. How to solve? Make yourself a 4-way relationship box. 


Let's look at question 1 again. 

"A 10 metre flag pole casts a shadow of 6 metres. A 12 metre pole would cast a shadow that is ______ metres in length."

Your two "measurements" are height (H) and shadow length (SL).

H           SL
10            6
12            ?

Remember MUAADON - Multiply Up And Across, Divide by the Other Number.

12 x 6 = 72
72/10 = 7.2

You could have set your box up another way.

H      10    12
SL     6      ?

6 x 12 = 72
72/10 = 7.2

Same answer...


Tricks to watch out for!

In question 3, the two "measurements" are time and widgets. However, the first "time" is in minutes and the second one is in hours. You need to either convert the 45 minutes to .75 hours, or convert the 7 hours to 420 minutes. Then set up your box, remember MUAADON, and get yourself the right answer. Rock on!

Math Doctor Video - New Version

See Math Doctor Link for the new Math Doctor Video - write out a 10 by 10 multiplication in under 1.5 minutes.

Come Undun

From  de.wikihow.com