In a maths test a student score 75 out of 100 marks.Express his marks as a decimal

75/100 = 0.75

75/100=0.75

To express the student's score as a decimal, you need to divide the score obtained (75) by the maximum possible score (100).

The formula to calculate the decimal is:
Decimal = Score obtained / Maximum possible score

In this case, the student's score is 75, and the maximum possible score is 100. So, the calculation would be:

Decimal = 75 / 100

To simplify this fraction, you can divide both the numerator and denominator by their greatest common divisor (GCD). In this case, the GCD of 75 and 100 is 25. Therefore,

Decimal = (75 / 25) / (100 / 25)
Decimal = 3/4

Therefore, the student's score expressed as a decimal is 0.75.