In this guide I will show you an easy way to tell if a month has 31 days.
First put your fists together and start with your pinky knuckle
The pinky will be January.
The next space in between your knuckles will be February.
The next knuckle will be March
Then April, and continue...
When you get to the next hand, the first knuckle should now be August.
Keep going until you get to December.
You now have an easy way to tell if a month has 31 days because it will land on a knuckle.
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The creator of this guide has not included tools