Find the sum of all the integers between -6.3 and 4.2.

Whole numbers are those numbers that do not have a fractional part. They can be both positive and negative.

Let’s write down all integers that are greater than -6.3 and less than 4.2:

-6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4.

Let’s find the sum of the written out numbers and get:

-6 + (-5) + (-4) + (-3) + (-2) + (-1) + 1 + 2 + 3 + 4 = -6 + (-5) + (-4) + 4 + (-3) + 3 + (-2) + 2 – 1 + 1 = -11.

Answer: -11.