1. (computer – Online Book)
1.3 Subtracting Integers
(computer – Online Book)

2. Subtracting Integers “adding the opposite” Steps 9 – 12
keep the 1st number 9
change – to + 9 +
change 2nd number to opposite 9 + (–12)
follow addition rules –3
(keep, change, change)
Use “Counters” & check with “Number line”.

3. Simplify 2 – 7 2 + (–7) – 5 (keep, change, change)
Use “Counters” & check with “Number line”.

4. Simplify –5 – 2 –5 + (–2) – 5 (keep, change, change)
Use “Counters” & check with “Number line”.

5. Simplify
15 – 23 15 +
(–23) – 8
(keep,
change,
change)
Try it!

6. Simplify
–14 – (–18)
–14 + 18 4
(keep,
change,
change)
Try it!

7. Simplify
5 – (–14) 5 + 14 19
(keep,
change,
change)
Try it!

8. Simplify –4 – 6 – (–13) –4 + (–6) + 13 –10 + 13 3 (keep, change,
Try it!

9. Simplify
–7 – (5 – 8)
–7 – (5 +
(–8))
–7 –
(–3) –7 + 3 – 4
Try it!

10. Simplify
│–12│ – 20 12
– 20 12 +
(–20) – 8
Try it!

11. Evaluate │a│ – │b│ for a = –7 and b = –8 │–7│ – │–8│ 7 – 8 7 + (–8) –1
Try it!

12. Sample Application Problem
(Please refer to Textbook Example 3 on p.17)

13. Homework
p.18 3,4-48 even, 55
Quiz 1.1 to 1.3
(MC #7,8,9)