Chapter 2

2. two Expression Mats side-by-side to find the value(s) which make the expressions equal.
6. The number you need to add to a given number to get a sum of 0. It is also called the opposite.
7. multiplying any number by 1 does not change the number.
8. substitute the value(s) given for the variable(s) and perform the operations according to the Order of Operations.
9. states that adding zero to any expression leaves the expression unchanged.
11. states that if two terms are added, then the order may be reversed with no effect on the total.
13. The specific order in which certain operations are to be carried out to evaluate or simplify expressions:PEMDAS(from left to right).
15. simplifies an expression by summing constants and summing those variable terms in which the same variables are raised to the same power.
16. the number we can multiply by to get the multiplicative identity,

1. states that if two expressions are multiplied, then the order may be reversed with no effect on the result.
3. a single number, variable, or the product of numbers and variables.
4. states that if a sum contains terms that are grouped, then the sum may be grouped differently with no effect on the total
5. states that if a product contains terms that are grouped, the product can be grouped differently with no effect on the result.
10. A symbol used to represent one or more numbers.
12. two Expression Mats side-by-side so they can be compared to see which represents the greater value.
14. no whole number multiple of one measurement can ever equal a whole number multiple of the other.