Given two points, the slope is how far up over how far along. These free printable worksheets give the coordinate pairs and ask for the slope, with whole-number answers throughout.
If they get stuck
The answer key prints on a separate page.
Rise over run is the whole formula, and writing it in words beats writing it in subscripts. From (2, 3) to (5, 9) the line goes six up and three along, so the slope is 2 — and a child who says it that way never has to remember which coordinate goes on top.
Subtracting in the same order on both the top and the bottom is where it goes wrong. Take the y values in one order and the x values in the other and the sign flips, which turns an uphill line into a downhill one. Sketching the two points before calculating catches every one of those.
One question from a sheet like this one, worked a step at a time — with a sentence saying what just happened and why.
Slope from two points, step by step