1. Quiz on negative number and addition of integers
2. Subtraction of integers:.subtraction is the reverse process of addition. Using a number line:
- Subtraction of a positive number is taken as a movement to the LEFT of the number line
- Subtraction of a negative number is taken as a movement to the RIGHT of the number line
(-3) – 4
2 – 3
(-1) – (-3)
2 – (-5)
0 – (-4)
3. Rule for subtraction: to subtract integers, we change the sign of the integer being subtracted and add them together according to the rule for addition of integers.
For any integers a, and,b,
a – b = a + (-b)
4. Absolute value of the difference:
For any integers a, and,b,
|a – b| = |b – a|
5. Home Work:
- Handout: two pages
- Workbook:
- page 8: 7
- page 9: 17
- page 10: 20