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What's the connection between decimals and fractions?

Can be mutually beneficial.

Decimals and fractions are interchangeable. One digit after the decimal point can be converted into a decimal with a denominator of 10, and two digits after the decimal point can be converted into a fraction with a denominator of 100, and so on. Some fractions can be converted into finite decimals, while others can be converted into infinite cyclic decimals or infinite acyclic decimals. Decimals and fractions are rational numbers and can be compared in size.