A21 I can add HTU + HTU. A22 I can add £ and p. A23 I can add ThHTU + HTU. A24 I can add U.t + U.t. A25 I can add more than two numbers with different amounts of digits. A26 I can add U.th + U.th. A27 I can add whole numbers and decimals. A28 I can add negative numbers in a context (e.g. temperature).