Learning Resources Cuisenaire Jr. Ants on a Log. A fun and engaging early introduction to Cuisenaire Rods! These chunky, log-style rods feature a number on a leaf on one side and the corresponding number of ants on the other. Appealing set promotes number identification and early subtraction and addition skills in primary children. Includes 20 rods and a handy storage tray. Largest rod measures 25cm L. Suitable for ages 4+.