One teaching aid that will be of assistance to all children is the preparation of cut-out pieces representing fractional numbers. Tell the children to obtain several pieces of cardboard or oaktag. Some can be in the shape of a square or rectangle, and the others should be circular. After carefully measuring off 1/1, 1/4, thirds, fourths, and fifths, cut out the pieces and store them in separate envelopes. When children have need for referral to a concrete illustration, the handy envelope assists them in their problem solving of fractions.