deltas oefenblaadjes rekenen 6 7 j tweede trimesterThis practice book contains 48 worksheets for arithmetic up to 20 without crossing the ten. They help your child to further practice what they have learned at school. During holidays, they offer a solution for refreshing the learned material. This way, your child stays up to date and learning difficulties are avoided. The worksheets are perforated, so you can easily remove them from the book.