In Math Lab, I showed a student how to find the slope of a line, using "rise over run" - subtracting the y's, subtracting the x's, then dividing.

I showed another student how to use a number line to find absolute value.

I worked with 3 students to find the areas and perimeters of a square, rectangle, and triangle in both inches and centimeters. They had fun measuring bricks on the wall, and tiles on the floor.