Crossword Puzzle

123
Across
  1. 1. The study of mathematical symbols and the rules for manipulating those symbols.
  2. 3. law of addition: For any three numbers a, b, and c, it is always true that (a+b)+c=a+(b+c).
Down
  1. 1. value: The distance a number is from 0.
  2. 2. sequence: A sequence of numbers in which each number can be computed by adding the same amount to the previous number.
  3. 3. grid: A grid used to illustrate values of algebraic expressions.