Question

How many composite numbers are there between $60$ and $90?$

Answer 1

Composite Numbers

Step $1:$ Definition of Composite numbers

The numbers which have more than two factors are called composite numbers.

Step $2$: Finding the total numbers.

Total numbers between $60$ and $90$ are $90-60-1=29$ (as $60$ and $90$ are not included).

Step $3$: Finding the prime numbers.

Seven prime numbers are there between $60$ and $90$ and they are :$61,67,71,73,79,83$ and $89$.

Step $4$: Finding the composite numbers.

Hence, composite numbers between $60$ and $90$ are $29-7=22$.