1. How To Convert Fahrenheit to Celsius
As if it was this simple all along…
2. How To Multiply Large Numbers In Your Head
Who knew?
3. How To Multiply By 11
Finally! I can now multiply more than single digits by 11 in my head.
4. Secret To Remembering The Numbers In Pi
Also a cool party trick.
5. How To Find Fractions Of Whole Numbers
6. How To Figure Out What Day Of The Week Falls On What Date…
You might be confused looking at the picture below, but the math is actually quite simple (albeit a bit elaborate). You’ll need the codes HERE, which will help you master this.
July simply has a code of 5.
20th is 6 because 7 goes into 20 twice, which is 14. 20 – 14 = 6.
2069 is 2 because the leap year code of 2068 is 1 and 2069 is 1 year after, so that’s 2.
20th is 6 because 7 goes into 20 twice, which is 14. 20 – 14 = 6.
2069 is 2 because the leap year code of 2068 is 1 and 2069 is 1 year after, so that’s 2.
The math can be difficult at first because there are a lot of codes, but it works out incredibly well once you pick it up. Here’s a separate example:
January 3, 2014 is a Friday, right?
So, January, according to the table, is 6, and we handle days by using multiples of 7. We don’t need to, so it’s actually just 3 in this case. Next we need to know the closest leap year, which was 2012. That has a year code of 1 and 2013 is 2 years after, so 3 again.
We get 6 + 3 + 3 = 12 – 7 = 5! FRIDAY!
7. How to Add And Subtract Fractions
8. How To Figure Out Multiples Of Nine
Just count up in the tens column and down in the ones column.
9. How To Use Your Hands For 5, 6, and 9 Times Tables
10. How To Figure Out Percentages
11. How To Remember Which Sign Is Greater Than and Which Is Less Than
Alligator always eats the bigger number!
12. Use Lines To Multiply
The above is actually a method used often by the Japanese. Here is video demonstrating:
