A number square is a great resource for exploring number patterns. Describe patterns and predict the next number in a sequence.

By entering 4 + + = you can make your calculator into an ?add 4?machine. Follow the instructions on these pages. Useful when adding the same number lots of times or looking at patterns and sequences.

Reading and writing Roman numerals up to 100 (I to C) and beyond.

Using Roman numerals to add and subtract.