Emilio Medina/Operation with Rational Numbers

Addition

100

8/10+9/10=

17/10

200

(-0.3)+(-3.1)=

-3.4

300

(-2)+(-7.6)=

-9.6

400

3/7+4/7=

1

500

-12.04+(-3.6)=

15.64

Subtraction

100

-3.8-(-6.1)=

2.3

200

1.4-2.6=

-1.2

300

3/8-1/8=

2/8

400

(-4/3)-7/6-(-8/3)=

1/6

500

(-2.6)-(-2.0)-(5.5)=

-6.1

Multiplication

100

1.8x2.8=

5.04

200

5.8x(-3.3)=

19.14

300

-3 1/3x-2 7/10=

9

400

-9/2x3/6x7/8=

1 31/32

500

4.7x3.2x(-4.3)=

-64.672

Division

100

81÷0.9=

90

200

0.016÷0.02=

0.8

300

8/3÷9/2=72/6=

12

400

9/5÷2=9/5÷1/2=

9/10

500

-7/10÷2/5= -7/10÷5/2=-35/20=

-1 15/20

Word Problems

100

From a rope 11 m long, two pieces of lengths 13/5 m and 33/10 m are cut off. What is the length of the remaining rope?

51/10 m

200

On one day a rickshaw puller earned $80. Out of his earnings he spent $68/5 on tea and snacks, $51/2 on food and $22/5 on repairs of the rickshaw. How much did he save on that day?

$73/2

300

A car is moving at an average speed of 202/5 km/hr. How much distance will it cover in 15/2 hours?

303 km

400

An airplane covers 1020 km in an hour. How much distance will it cover in 25/6 hours?

4250 km

500

A drum full of rice weighs 241/6 kg. If the empty drum weighs 55/4 kg, find the weight of rice in the drum.

317/12 kg