The number one difficulty in the math classroom, regardless of grade, is understanding operations involving positives and negatives. I use this resource with all grades so that they have a handy guide to direct them to solving using addition, subtraction, multiplication, and division.
This will be a priceless addition to your math resources.
The slides (or pdf) have a racehorse theme.
If you would like great CCSS-aligned math resources, please visit My Store