In year 2 children will continue to develop their understanding of addition, beginning to work with larger numbers, but keep them below 100. Indeed, quite a lot of children will not be ready for dealing with 2-digit numbers. Don’t introduce larger numbers until they are really confident with single digit addition.
Continue to emphasise the vocabulary: more, add, sum, total, altogether, equals and the equals sign (=).
The idea that adding zero to a number leaves it the same can be a difficult concept to understand and zero should be included when asking oral addition questions.