Quick mental and written addition and subtraction of larger numbers relies on rapid recall of number bonds to both 10 and 20. It is imperative that this knowledge is secured as early as possible and constantly revisited to refresh it. Dont let learning Number Bonds bug you! Count the total number of critters on an open card before working out how many are hiding behind e.g. the sofa, tree or sand castle using numberlines, tracks or just your brain. Set includes multi-level game rules for whole class and small group learning printed on the box and is suitable for pupils from age 4-7 and upwards or older pupils with SEN. Contains 30 laminated folding Critter Cards.