Very hard mental addition
These are about as hard as you will get for mental arithmetic. Many children (and adults) will find them very tricky!
5 pages
Very hard mental addition
These are about as hard as you will get for mental arithmetic. Many children (and adults) will find them very tricky!

Free Monthly Resources
Print/download our free resources, plus a 7 day free trial with 5 further sets of worksheets and unlimited game plays.