This is an obvious development of our Make 10 and Make 20 activities.
The downloadable pdf file contains three 10 by 10 grids of numbers. The children have the challenge of finding a line of three numbers that total 15. Each board features 14 or 16 such lines of numbers.
If the sheets are laminated the children can be encouraged to work together with white-board pens to find as many as they can. Read more »