Question

Can someone please help me with the Multiplication of Rational Numbers Quick Check for Connexus??? Here are the questions:

1) -7/9 x 3/5
A) -27/45
B) -7/15
C) 7/15
D) 27/45

2) -2/5 x -1 1/4
A) -1 1/10
B) -1/2
C) 1 1/10
D) 1/2

3) 1 3/5 x -3/4
A) -20/24
B) -9/20
C) -1 1/5
D) -1 9/20

4) -7/8 x -1 3/7
A) -1 3/8
B) -1 21/56
C) 1 3/8
D) 1 1/4

PLZ HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

just multiply tops and bottoms:
1) -21/45
and so on

Answer 2

You multiply the numerator with the numerator and the denominator with the denominator.

1)

- 7 / 9 • 3 / 5 = - 7 • 3 / 9 • 5 =

- 3 • 7 / 3 • 3 • 5 = - 7 / 15

2)

1 1/4 = 1 + 1 / 4 = 4 / 4 + 1 / 4 = 5 / 4

- 2 / 5 • ( -1 1/ 4 ) = - 2 / 5 • ( - 5 /4 ) =

( - 2 ) • ( - 5 ) / 5 • 4 = 2 • 5 / 20 =

10 / 2 = 1 / 2

3)

1 3/5 = 1 + 3 / 5 = 5 / 5 + 3 / 5 = 8 / 5

1 3/5 • ( - 3 / 4 ) = 8 / 5 • ( - 3 / 4 ) =

8 • ( - 3 ) / 5 • 4 = - 8 • 3 / 5 • 4 =

- 4 • 2 • 3 / 4 • 5 = - 2 • 3 / 5 = - 6 / 5 =

- ( 5 / 5 + 1 / 5 ) = - ( 1 + 1 / 5 ) =

- 1 1/5

4)

1 3/7 = 1 + 3 / 7 = 7 / 7 + 3 / 7 = 10 / 7

- 7 / 8 • ( -1 3/7 ) = - 7 / 8 • ( -10 / 7 ) =

- 7 • 10 / - 7 • 8 = - 10 / - 8 = 10 / 8 =

2 • 5 / 2 • 4 = 5 / 4 = 4 / 4 + 1 / 4 =

1 + 1 / 4 = 1 1/4