Number Lines

Yesterday, at a party, one of my favorite seven year olds explained she failed a test in subtraction.  Last night, I thought about this issue and remembered number lines.  I think we forget how abstract math can be for younger children. Teachers used to tape number lines on to desks.  You can use a ruler or yard stick to show kids how to add or subtract.  Once the child understands the concept she won’t need it.  But what a boost for a child struggling.