1.
The side opposite the right angle in a right-angled triangle
2.
The operation that reverses the effect of another operation.
3.
A Metric measure of distance. Equal to 1,000 meters.
4.
A special way of doing division that is quick to do (once you know how)
5.
Doing calculations using only the mind, without the aid of any tools like calculators, pen, or paper.
6.
A list of numbers that follow a certain sequence or pattern.
7.
A ratio of the number of ways something can occur to the number of ways it cannot occur.
8.
The value of where a digit is in the number.
9.
How much there is of something.
