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18.812 and 31.187
3.5 and 14.35 are.
there is an infinite number, consider 0.6999999 + 0.0000001 or -0.2 + 0.9
8.7 x 7.3 = 63.51 8.7 - 7.3 = 1.4 The two numbers are therefore 8.7 and 7.3.
Both are ways of representing numbers. Fractions can only be used for rational numbers whereas a decimal representation can also be used for irrational numbers. However, all fractions are exact values whereas any fractions whose denominators has a factor other than 2 or 5, and all irrationals can only be represented by decimals that are infinitely long. Since an infinitely long number cannot be written, the decimals for these numbers are approximations.