Answer:
2
Step-by-step explanation:
Think: 2.39 is sandwiched between the perfect squares 1 and 4.
The difference between 1 and 4 is 3. From 1 to 2.39 is a step of 1.39; from 2.39 to 4 is a step of 1.61. Therefore, 2.39 is closer to 1 than to 4, and we estimate 2.39 to be 2 (to the nearest integer).
