Algebra

7. negative number is written with a minus sign in front.
8. article or substance that is manufactured or refined for sale.
10. word or phrase used to describe a thing or to express a concept, especially in a particular kind of language or branch of study.
12. something or give a share or part of something.
13. rule that tells us the sequence in which we should solve an expression with multiple operations.

1. that the numbers on which we operate can be moved or swapped from their position without making any difference to the answer.
2. something or give a share or part of something.
3. a symbol or a combination of symbols used in algebra, containing one or more numbers, variables, and arithmetic operations: ...
4. consistent or having a fixed pattern; liable to change.
5. negative number is written with a minus sign in front.
6. fraction in which the numerator is greater than the denominator, such as 5/4
9. when more than two numbers are added or multiplied, the result remains the same, irrespective of how they are grouped.
11. numerical quantity that is not a whole number