There are odd numbers, even numbers, multiples, single-digit and two-digit numbers. Back to top. Activity: Numbers to 100. Complete this interactive activity on numbers to 100.

And there are many ways to categorise numbers as even or odd. We may memorise the rule that numbers ending in 1, 3, 5, 7, or 9 are odd while numbers ending in 0, 2, 4, 6, or 8 are even.

We may memorize the rule that numbers ending in 1, 3, 5, 7, or 9 are odd while numbers ending in 0, 2, 4, 6, or 8 are even. Or we may divide a number by 2 — where any whole number outcome means ...