Answer:
a)

b)
Explanation:
We need to compare the given number
a) We have 546 and 322
We clearly know that 546 is a larger number than 322.
Thus, we could use the greater than symbol to compare them.

b) We have 540 and 997
We clearly know that 540 is a smaller number than 997.
Thus, we could use the smaller than symbol to make the comparison.
