1. Day 4 Name all the sets of numbers to which each number belongs to:
R = real, Q = rational, I = irrational, Z = integers, N = natural, W = whole. 1. 2. 3. 4.
Compare using <, > or =. 5. 6. 7.
Write an algebraic expression and define the variable:
8. Six less than four times a number.

2. 2.1/2.2 Adding/Subtracting Rational #’s
I can simplify numerical expressions using order of operations.
Don’t forget to write this “I Can” in your target sheet.
(Bold words above are to signal those words were listed as an objective on the pre-test)

3. 2.1/2.2 Adding/Subtracting Rational #’s
Additive inverse - The opposite of a #.

4. Identity Property of Addition -
For every rational number n, n+0=n.
Inverse Property of Addition -
For every rational number n, there is an additive inverse –n such that n + (-n)=0.

5. RULES
To add numbers with the same sign, add their absolute values. The sum has the same sign as the addends (#s being added).
To add numbers with different signs, find the difference of their absolute values. The sum has the same sign as the addend with the greater absolute value.

6. Adding using a number line model

7. To subtract a number, always do
Bigger absolute value # - Smaller absolute value #
Remember the bigger absolute value gets the sign.

8. Simplifying Absolute Values
Always simplify what’s inside first before taking the absolute value
Ex. Simplify the following
−13−(−21)
10−1
19−20
Ex. Evaluate the following
𝑥−(−𝑦) for x = - 3 and y = - 6
−4𝑏− 𝑎 for a = - 2 and b = 3 1 2 8 9
- 9 1
- 16