Fact Family / Days of the month song FF#1

FACT

What is a FACT family in Maths

In a mathematical equation, all the numbers included in the equation are considered to be a family and can inter-relate. For example, 2 + 3 = 5; as a family, these numbers can relate in other ways. 5 - 2 = 3, 5 - 3 = 2, 2 + 3 = 5, 5 - 3 = 2. 2, 3, and 5 are the numbers included in the family.

FUN

Let's have fun singing a song today.

A wonderful song that helped me remember the days of each month of the year in my young age and surely will help YOU

Thirty days hath September is a traditional English mnemonic rhyme, of which many variants are commonly used in English-speaking countries to remember the lengths of the months in the Julian and Gregorian calendars.

The words  to "Thirty days hath September" are used by many adults to prompt them into recalling how many days there are in each month! It's therefore often referred to as the Days of the Month Rhyme! The origin  of the lyrics to "Thirty days hath September" are obscure but use of olde English can date this poem back to at least the 16th century. 

In the coming days you will surely be found muttering the words of the "Thirty days hath September" poem

Thirty days hath September,

       April, June, and November.

All the rest have thirty-one,

     Excepting February alone,

And that has twenty-eight days clear,

      And twenty-nine in each leap year.

The French typically use a mnemonic by counting on the knuckles of one's hand to remember the numbers of days of the months.Count knuckles as 31 days, depressions between knuckles as 30 (or 28/29) days. 

Start with the index finger knuckle as January, and count one finger at a time towards the little finger knuckle (July), saying the months as you go. Then jump back to the index finger knuckle (now August) and continue for the remaining months.

One variant of this approach differs after reaching the little finger knuckle (July): instead of wrapping around back to the index finger, some people reverse direction and continue from the little finger knuckle (counting it for both July and August) and ending on the middle finger knuckle. 
Still others use two hands (as shown in the diagram, right): starting with the little finger knuckle of the left hand proceed to the left index finger knuckle, then (swapping hands) jump to the right fist's index finger knuckle for August, finishing on the knuckle of the right ring finger (December).