1. Multiplying Integers

2. Copy and complete the table.
Multiplication
Repeated Addition
Sum
3 • (–5)
–5 + (–5) + (–5)
–15
5 • (–4)
–20
–4 + (–4) + (–4) + (–4) + (–4)
2 • (–8)
–8 + (–8)
–16
–40
4 • (–10)
–10 + (–10) + (–10) + (–10)

3. Evaluate each product.
1. 2(–6)
= –12
2. 4(–3)
= –12
3. 7(–2)
= –14

4. Multiplying Integers
The product of two integers with the same sign is positive.
The product of two integers with different signs is negative.
The product of zero and any integer is zero.

5. Examples
3(4) = 12
–3(–4) = 12
3(0) = 0
3(–4) = –12
–3(4) = –12
–4(0) = 0

6. Multiply please…
4. –3 • 5(–4)
= –15(–4)
= 60

7. How about this one?
5. –9(–8)(–5)
= 72(–5)
= –360

8. Now for the homework…

9. The rules for dividing integers are similar to those for multiplying

10. Dividing Integers
The quotient of two integers with the same sign is positive.
The quotient of two integers with opposite signs is negative.
Division by zero is undefined.

11. Examples
12 ÷ 3 = 4
12 ÷ –3 = –4
–12 ÷ (–3) = 4
–12 ÷ 3 = –4

12. Divide please…
1. 10 ÷ –2
= –5
2. –28 ÷ –4
= 7 3.
= –8