These boards are great for students to practice before and after numbers. You can laminate them and have the students use dry erase markers. I laminates them and then wrote the missing numbers on square tiles that match the color of the board - the students get their set and work on putting the tiles in the correct spots. This is good to work one-on-one or independently.
The boards are also color coded: Red=easy 1-10, Orange=easy/medium 5-20, Green=medium 15-30, Blue=medium/hard 20-30 and Purple-hard 25-40.
This is editable in Word!