Multiplication - 1.3
(a) The product is positive if the two signs are the same , either both positive or both
negative. Examples: -5(-4) = +20; (+4)(+2) = +8
(b) The product is negative if the two signs are different , one positive and one
negative. Examples: (-8)(4) = -32; +6(-5) = -30
(c) When multiplying more than two terms, the product is positive if there is an even
number of signs and the product is negative if there is an odd number of negative
signs.
Examples: (-2)(-1)(8) = +16
(-1)(3)(+2) = -6
-2(-10)(-5) = -100
-4(2)(-2)(+2) = 32
Multiply:
1) (-3)(5) =
2) -8(-3) =
3. (-1)(-1) =
4) (+9)(7) =
5) +5(-10) =
6) (-6)(-2) =
7) (-7)(-8) =
8) -3(-9)=
9) -8(4) =
10) (-2)(-3) =
11) +6(+7) =
12) -8(+8) =
13) -3(-3) =
14) (-7)(-5)=
15) (-5)(3)=
16) (-2)(-2)(4)=
17) -3(6)(-6)=
18) -8(-7)(-1) =
19) (5)(5)(+3) =
20) (3)(-4)(+8) =
21) (1)(-1)(-1) =
22) (-2)(+2)(2) =
23) -6(-3)(-2) =
24) 3(+2)(-6) =
25) 5(-2)(-2) =
26) (1)(-2)(-1) =
27) (7)(3)(-2)=
28) (+5)(-2)(3)=
29) (+4)(+2)(3)=
30) (-8)(8)(4) =
31) -7(-6)(-2) =
32) -2(+5)(-3)=
33) -4(+5)(-2)=
34) -3(-2)(-7) =
35) (-5)(-5)(5) =
36) +8(2)(-
) =
1/4
37) (3)(-3)(-
)
38) -4(-2)(3)(-1) =
39) (+3)(7)(
) =
40) -5(1)(-1)(-1) =
1/3
1/7
41) (-3)(-2)(-7)=
42) (-9)(5)(
) =
43) (2)(2)(2)(-
) = 44) (-4)(2)(3)(-3) =
1/9
1/2
45)
46)
47) 5(-2)(5)(-2) =
48)
-10(3)(2)(1/5) =
(5)(6)(3)(1/3) =
(-2)(5/6)(4)(-3) =
7