Watch these videos. The first shows word problems involving consecutive integers. The second shows a more challenging problem involving the sum of odd integers. When summing odd integers, the equation must be slightly altered.
Source: Khan Academy, https://youtu.be/W254ewkkMck, https://youtu.be/d8De3xcVmnw
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.