Give examples.

This is some interesting homework...I have never done front-end estimation before...had to search it up!

1.5 + 1.5 = 3.

Suppose we had 1.54 + 1.53. Our front-end estimation would be 1.5 + 1.5 = 3.

2.5 - 1.5 = 1.

Suppose we had 2.52 - 1.53. Our front-end estimation would be 2.5 - 1.5 = 1.

Thank you, AzizHusain.