3 balls in a row pattern- NRICH

Launch: Warm Up: Relays  Trees, Rock bridge. Run around the tree, jump over the rock and climb under the bridge. {...}

Place a whole lot of unifix on the floor. Ask children to gather a collection.   Now work out the{...}

First make some estimations: How many would be too low? How many would be too high? What is your estimation?{...}