Question

Encircle prime numbers: $11,21,31,44,59,65,73,37,94,85$.

Answer 1

A natural number which has only two factors $1$ and the other number itself is a prime number.

Here, $11,31,59,73$ and $37$ are the prime numbers.

Therefore, $\overline{)11},21,\overline{)31},44,\overline{)59},65,\overline{)73},\overline{)37},94,85$.