The main focus in Y2 is on understanding number and being fluent applying this understanding to a range of situations. Fractions and multiplications are often areas that can take longer to become confident using.
Here are a some great questions for each of the areas that will be covered in Year 2.
Addition and subtraction
Fractions
Geometry
Statistics
Number and place value
Multiplication and division
Measurement
All questions taken from White Rose Mastery assessment document
A great way of becoming comfortable with number is to work with part-part-whole models. This way children become familiar with the inverse relationship between addition and subtraction.