The elementary arithmetic rule of fractions is to add and subtract fractions with denominator, with denominator unchanged and numerator added and subtracted. Fractions with different denominators are added and subtracted, first divided, then the denominator remains the same, and the numerator is added and subtracted. Multiplication is divided first, numerator multiplied by numerator is the numerator of product, and denominator multiplied by denominator is the denominator of product. Dividing by a number is equal to multiplying the reciprocal of this number.

Operation order of fractional elementary arithmetic

The operation order of fractional elementary arithmetic is the same as integer operation. If it is the same level operation in the formula without brackets, it should be from left to right. If there are both addition, subtraction, multiplication and division, calculate what is in brackets first, and then what is outside brackets. When calculating with fractions, if fractions can be converted into finite decimals, they should be converted into finite decimals for calculation.