KS2 maths - Addition - add two 2 digit numbers crossing the tens boundary

A lesson worksheet to practise a specific learning step which can be used with any teaching method.
A lesson worksheet consisting of six initial questions that focus on adding a two digit number to a two digit number that cross the tens boundary. Also contains a further six questions for pupils who may have misconceptions.
Finally, a challenge question to allow pupils to use this skill in a more open ended task.
Two answer sheets are included: One with all answers correct and one with a deliberate mistake (one per each set of six questions) which is great for self-marking, allowing for teacher and/or pupil assessment.