One of my students was the "walker". He stood on the number line at the 6. The subtraction sign told him to then face the negative side of the number line, so he turned around to face negative. the -4 is a negative number, so it says to walk backwards 4 spaces. So, while facing negatively, he is walking backwards (which actually puts him more positive).
Great idea for teaching time! Have each child make one of these. Give each child a sheet with everyone's name on it. They walk around and ask their peers, "What time is it?". Without "telling", they simply show their watch. Times are recorded on the record sheet. When each child has "asked" everyone, meet back and check.
Problem Solving - Addition & Subtraction Story Problems from All Students Can Shine on TeachersNotebook.com (43 pages) - This pack contains 20 addition story problems and 20 subtraction story problems. That's 40 problems in all!!