2.1 Integers & Absolute Value 2.2 Adding Integers
Vocabulary Negative numbers: numbers less than zero. Integers: all the whole numbers, zero, and all the negative whole numbers. { …-3,-2,-1,0,1,2,3,…} Zero is not positive or negative. Absolute value: the distance away from zero on a number line.
|3| = 3 the absolute value of a positive number is just that same number. |-3| = 3 the absolute value of a negative number is its opposite. EXAMPLES: Page 59: # 1-19
Adding Integers Two Rules: 1. To add numbers with the same sign, ADD the absolute values and the answer has the same sign as the original numbers. EXAMPLE: = 19 = -8
2. To ADD numbers with different signs, SUBTRACT the absolutes values and the answer has the same sign as the number with the largest absolute value. EXAMPLE: = = 4 = = -3 = 10 – 4 = -6
Homework: Page 67: # EVENS