Overcoming barriers in mathematics –

Relate addition to counting on; recognise that addition can be done in any order, use practical and informal written methods to support the addition of a one-digit number or a multiple of 10 to a one-digit or two-digit number

Understand subtraction as 'take away' and find a 'difference' by counting up; use practical and informal written methods to support the subtraction of a one-digit number from a one-digit or two-digit number and a multiple of 10 from a two-digit number

Add or subtract mentally a one-digit number or a multiple of 10 to or from any two-digit number; use practical and informal written methods to add and subtract two-digit numbers