(1) Decimal component number: There are several decimals. Just write a few zeros after 1 as the denominator and remove the decimal points in the original decimal as the numerator, so as to reduce the number of quotation points.

⑵ Fraction into decimals: numerator divided by denominator. Those that are divisible are converted into finite decimals, and some that are not divisible are converted into finite decimals. Generally three decimal places are reserved.

(3) A simplest fraction, if the denominator does not contain other prime factors except 2 and 5, this fraction can be reduced to a finite decimal; If the denominator contains prime factors other than 2 and 5, this fraction cannot be reduced to a finite decimal.

(4) Decimals are converted into percentages: just move the decimal point to the right by two places, followed by hundreds of semicolons.

5. Decimal percentage: To convert a percentage into a decimal, just remove the percent sign and move the decimal point to the left by two places.

(6) Fractions are converted into percentages: usually, fractions are converted into decimals first (three decimal places are generally reserved when they are not used up), and then decimals are converted into percentages.

(7) Decimalization of percentage: First, the percentage is rewritten as the number of components to make a quotation that can be simplified to the simplest score.

The meaning of divisibility

When the integer A is divided by the integer b(b≠0), the quotient is an integer without remainder, so we say that A can be divisible by B, or that B can be divisible by A ... When the quotient obtained by dividing A by B is an integer or a finite decimal, and the remainder is 0, we say that A can be divided by B,

(or the number b can be divided by the number a) Here, the number a and the number b can be natural numbers or decimals (the number b cannot be 0).