Multiplying and Dividing Rational Numbers

Multiplying Rational Numbers

100

-2.57 x 3.6=

Answer: -9.252

Work:       2.57

           x      3.6

           __________

               1542

               7710

        _____________

           -9. 252

200

5/9 x 3/15=

Answer: 1/9

Work: 5/9 x 3/15= 1/9

300

3/2 x -7/10=

Answer: -1 1/2

Work: 3/2 x -7/10= -21/20= -1 1/2

400

5/12 x 9/10=

Answer: 3/8

Work: 5/12 x 9/10= 3/8

500

3/4 x 1/3=

Answer: 1/4

Work: 3/4 x 1/3= 1/4

Mixed Numbers by Multiplying Rational Numbers

100

1 1/3 x 1 2/3 =

 Answer: 2 2/9

Work: 20/9 = 2 2/9

          

200

1 1/3 x 2 1/5=

Answer: 2 14/15

Work: 44/15= 2 14/15

300

1 3/8 x 3 1/3=

Answer: 4 7/12

Work: 55/12= 4 7/12

400

1 3/4 x 7 1/5=

Answer: 12 3/5

Work: 1 3/4= 4/4 x 1 + 3= 7/4 = 12 3/5

500

3 1/12 + 11 2/5 + 4 3/15=

Answer: 18

Work: 3 + 1/12 + 11 + 2/5 + 4 + 3/15= 3+ 11+4+ 1/12 + 2/5 + 3/15=

Dividing Rational Numbers

100

7

Answer: 1/7

200

-19/21

Answer: 21/-19

300

100

1/100

400

5/2 / 1/4= 

Answer: 10

Work: 5/2 x 2/1=10

500

5/11 / 6/7=

Answer: 35/66

Work: 5/11 x 7/6= 35/66

Mixed Numbers by Dividing Rational Numbers

100

-5 1/5 / 2 1/3=

Answer: -2 8/35

Work: -5 1/5 / 2 1/3

          -26/5 / 7/3

         -26/5 x 3/7= -78/35= -2 8/35

200

3 2/7 / 1 1/4=

Answer: 2 22/35

Work: 92/35= 2 22/35

300

1 3/8 / 1 1/12=

Answer: 1 7/26

Work: 33/26= 1 7/26

400

2 1/4 / 1 1/2=

Answer:1 1/2

Work: 3/2= 1 1/2

500

1 4/11 / 1 1/4=

Answer: 1 1/11

Work: 12/11= 1 1/11

Negative Numbers by Multiplying and Dividing

100

-2/7 x 1/6=

Answer: -1/21

Work: -2/7 x 1/6

          -1/7 x 1/3=

                 -1/21

200

-1/7 x 4/5 x (-7)=

Answer: 4/5

Work: -1/7 x 4/5 x (-7)

         -1/1 x -1/1 x 4/5

                  1/1 x 4/5= 4/5

                 

300

-7 x 3/49=

Answer: -3/7

Work: -7/1 x 3/49= -7 x 3/-1 x 49= -21/49= -3/7=-3/7

400

-5/9 x -3/15=

Answer:1/9

500

-8 1/2 - 4 2/9=

Answer: 12 13/18

Work: -8 1/2 + (-4 2/9)=

- 8 9/18 + -4 4/18=