There are some common reasons that an answer may look correct to you, but has been marked incorrectly. This gives an overview of some of these reasons.

**Answers with powers**

Powers **must** be entered using our online keyboard or a regular keyboard using the keyboard shortcut '^'.

If the student has used a special character it will not be accepted.

If the student's power looks smaller than the one given as a correction, they may have entered a power of a power ('^^' instead of '^'), rendering the answer incorrect.

**Coordinates**

Are the brackets present? Are there commas or brackets missing? Is the comma mistakenly a full stop? Is there an extra bracket? All of these will cause a coordinate answer to be marked incorrectly.

When giving multiple coordinates, the order given does not matter as long as they are in the format (x,y)

**Answers with a Multiplication Sign**

A common mistake is for a student to use an 'x' rather than the multiplication sign from the keyboard. 'multiplied by' must be entered using the 'times sign' from the on-screen keyboard: