A Mathematical crossword

Positive and negative numbers
Working out an equation with the letters unknown
Putting numbers in place of algebraic terms
Putting brackets back in
Multiplying out the brackets
Where there is an answer to the sum, you may need to use substitution
Where two sums are equal to each other
3.14 (2dp)
()
a² + b² = c²
Multiplying a quantity by a power
Separate numbers up
Times a number so many times by another number
The process of adding a group of numbers together
The process of taking away a group of amounts
A number which times by itself, and is shown by a power next to the number
A quantity or amount
A quantity of something/price