If the meanings haven't changed since I was a child, the 3 R's are for: Reading, 'Riting, and 'Rithmetic.
ReadingwRitingaRithmetic
In the UK, "Reading, writing and arithmetic" is stated as being the three 'Rs' essential for a good education.
In education the three Rs are reading, writing, arithmetic.
They are about the same as two or three normal size rooms together.
Reading, Writing, Arithmatic
reduce, reuse, recycle.
Three school subjects that have letter R in - not always beginning with R - namely Reading wRiting aRithmetic
The cast of Eco-Man and the Three Rs - 2010 includes: Joseph Scott Rodriguez as Eco-Man
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reduce reuse recycle
To conserve resources