Score addition and subtraction: for scores without scores, add and subtract directly; For fractions with fractions, make the denominator the same by differentiation, and then add and subtract. For example:

( 1) 1/2 + 3/4 = 2/4 + 3/4 = 5/4

(2) 1/2 + 1 1/4 = 2/4 + 5/4 = 7/4

Fractional multiplication: Multiply the numerator and denominator of a fraction respectively, and then connect the two products with a fractional line to form a product. For example:

( 1) 1/2 × 3/4 = ( 1 × 3) / (2 × 4) = 3/8

(2) 1/2 × 1 1/4 = ( 1 × 5 + 1) / 2 = 3/4

Fractional division operation: the essence of fractional division is the inverse operation of fractional multiplication, that is, the numerator and denominator of divisor are exchanged, and then the numerator and denominator are multiplied by the numerator of dividend respectively. For example:

( 1) 1/2 ÷ 3/4 = 1/2 × 4/3 = 4/6 = 2/3

(2) 1 1/4 ÷ 1/2 = 1 1/4 × 2/ 1 = 2 2/4 = 2 1/2

Simplification of fraction: Simplified fraction refers to the simplest form of fraction after the numerator and denominator of fraction are divided by the common factor. For example:

(1) 6/8 can be changed into 3/4.

(2) 8x/ 12x？ Can be simplified to 2/3 times.

The above is the basic principle of high school math score calculation. It is suggested to learn the basic knowledge first, do more exercises, and remember to pay attention to formulas and precautions during operation to avoid mistakes.