Any terminating decimal is rational since it can be express as a fraction. Recurring decimals are also rational.
E.g 3.456 = 3456/1000 or 4.555... = 41/9
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Decimal numbers that can be expressed as fractions are rational but decimal numbers that can't be expressed as factions are irrational
Yes, all rational numbers can be written as decimal numbers.
Rational numbers can be written as a fraction with a non-zero denominator,as a terminating,a decimal,or a repeating decimal.
All terminating decimal numbers are rational.
All real numbers have a decimal representation. Rational numbers have decimal representations that terminate or repeat infinitely. Irrational numbers have decimal representations that are non-terminating and non-repeating.