LESS THAN

Example:

100 marbles are needed to make a box full.

Question: Estimate the number of marbles when some of the marbles are taken out half from the box.

Answer: The estimation of the number of marbles in the box is 50 marbles, which is less than 100 marbles.

MORE THAN

Example:

Half of a pond has 100 fish.

Question: Estimate the number of fish to make the pond full.

Answer: The number of fish is more than 100 to make the pond full.