#### Understanding

Algebraic expressions specify numerical calculations using numbers and letters or symbols standing for numbers.

### What to look for

Students leave behind the symbol “x” for multiplication and come to understand that the juxtaposition of a number and a variable such as 3x implies multiplication between 3 and x.### Sample Assessment

If a=115 and b=45, what would be the value of the expression b+(a - b)?a 115 b. 185 c. 205 d. 275

Answer: a. 115