Figuring Leap Years In Your Head I/E

When Augustus and Julius Caesar were working on the Gregorian calendar;The one we use today, February was going to have 29 days every year and 30 days every leap year;  At that time August had only  30 days, so why the change to 31 days in August?

Augustus Caesar notice his brother's month of July had 31 days, so he took the day off of February then place it on his month of August,so both months of July and August would now have 31 days.

               July was named after Julius Caesar 
         August was name after  Augustus Caesar

Why do we have leap year?  The earth makes a complete rotating circle around the sun in 365 1/4 days or 365 days and 6 hours. The leap year is to make up for the extra day, usually every four years.Read on...

To determine if a year is a leap year all we need to do is divide the year by 4 and to see if there is a reminder, if not then it's a leap year...

Let's take the year 2020, put the calculator away you won't need it, , simply take a look at the last two digits of 2020 if the last two digits of a number are a multiple of 4 then the whole number can be divided by 4 without a reminder.So 2020 is a leap year meaning that February will have 29 days that year instead of the usual 28.

It doesn't matter if a number has a zillion digits if the last two digits are a multiple of 4 then it can be divided by 4 evenally.
To make a game out of it,  you can use your calculator, input  some random digits, BUT let the last two digits be a multiple of 4, then divide by 4 and see what happens.There should be no remainder. (end)