Learning Resources Giant Number Bonds Set, Ast (LRN5214) 1 SetGiant number bonds let you visually show part part whole relationships and fact family fun. Magnetic design attaches to compatible surfaces to easily display them to the entire classroom. Number bonds are perfect for helping students understand number relationships while developing addition and subtraction skills. Set includes demo circles, demo squares, lines and magnetic discs. Number bonds are designed for children ages 5 and up. General