Tell the students to cut the bread into any given number of pieces. Have the students eat two pieces. Continue until the bread is gone. Use different foods to cut and add slices, etc. Teacher cut up a piece of fruit or vegetable.
Students count the pieces.
Have a number of students eat some of the slices. Use different kinds of foods until everyone has a chance to help with the subtracting. As you work on the above demonstration of cutting the bread and fruit, point out you are cutting the food in half , in fourths , etc. Graph the students favorite foods, most disliked foods, foods never tried, foods you can fix for yourself, etc. Count the results.