three Rs

three R's

noun
1.
reading, 'riting, and 'rithmetic, regarded as the fundamentals of education.
2.
the fundamentals, basic knowledge, or skills of any system or field: the three R's of good government.

Origin:
1820–30

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World English Dictionary
three Rs
 
pl n
the three Rs the three skills regarded as the fundamentals of education; reading, writing, and arithmetic
 
[from the humorous spelling reading, 'riting, and 'rithmetic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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