Oval worksheets: Smaller numbers to help consolidate understanding of different operations (x - + ÷ doubling, and halving)

One star worksheets: These number problems help build up fluency (being able jump around between different types of problem and solve them quickly)

Two star worksheets: These are reasoning problems and often require children to explain or demonstrate how they reached an answer, how they know it is correct or give several alternative answers.

All of these skills are important!