By Year 2, you should already be fairly confident with:
Reading and writing numbers to 100.
Addition and subtraction within 20
Writing number sentences using the symbols for addition, subtraction and equals (+ , - , =) .
Basic understanding of multiplication, division, finding 1/2 and finding 1/4.
Addition of 2-digit numbers beyond 20
Subtraction of 2-digit numbers beyond 20
Multiplication and division facts for the 2, 5 and 10 times tables
Finding and recognising 2/4, 3/4, 1/3
Recognising 1/2 and 2/4 as equivalent fractions