"Addition and subtraction of scores" is the key content of Unit 6 in the second volume of Grade Five. Addition and subtraction of fractions can be divided into addition and subtraction of fractions with the same denominator and addition and subtraction of fractions with different denominators. Fractions are added and subtracted with the denominator unchanged, as long as the numerator is added and subtracted.
To add and subtract fractions with different denominators, we should first divide the fractions into fractions with the same denominator, and then add and subtract the fractions with the same denominator. Fraction addition and subtraction can be divided into same denominator fraction addition and subtraction and different denominator fraction addition and subtraction. Fractions are added and subtracted with the denominator unchanged, as long as the numerator is added and subtracted. To add and subtract fractions with different denominators, we should first divide the fractions into fractions with the same denominator, and then add and subtract the fractions with the same denominator.
Add and subtract with fractions, add and subtract with integers and fractions, add and subtract with fractions and fractions, and then combine the results. The fractional part adds up to more than 1, and the result of the fractional part is converted into a fraction and then merged with the integer part.
Fractional subtraction is not enough, so we need to borrow the integer part of 1 for subtraction and finally merge. You can turn the band score into a false score, and then do the calculation according to the law of fractional addition and subtraction.
The meaning of the score:
An object, a figure and a unit of measurement can all be regarded as the unit "1". Divide the unit "1" into several parts on average, and the number representing such a part or parts is called a fraction. In the fraction, the denominator indicates how many shares the unit "1" is divided into, and the numerator indicates how many shares there are; One of them is called fractional unit.
The numerator and denominator are multiplied or divided by the same number (except 0) at the same time, and the size of the fraction remains the same, which is the basic property of the fraction. In fractions, the number of equal parts described is numerator, and the type or category of parts is denominator. In informal text, numerator and denominator can only be distinguished by their positions, but in formal text, they are always separated by fractional lines.
The fractional line can be horizontal (such as), oblique (such as) or oblique (such as). These marks are called horizontal line, diagonal line (US) or diagonal line (UK), divided diagonal line and fractional diagonal line respectively. In typesetting, scores with horizontal dividing lines are also called en scores or nut scores, and scores with diagonal lines are called em scores, which is the width of the lines they occupy.