Recognise and extend number sequences formed by counting from any number in steps of constant size, extending beyond zero when counting back. For example: count in steps of 25 to 1000 and then back; count on or back in steps of 0.1, 0.2, 0.3 ...;
Recognise multiples of 6, 7, 8 and 9 up to the tenth multiple. Know and apply tests of divisibility by 2, 4, 5, 10 or 100.
Make and investigate a general statement about familiar numbers or shapes by finding examples that satisfy it.