SOLVING WORD PROBLEMS USING DECIMAL OPERATIONS

Problem 1 :

Find the area of a square whose side is 3.60 m.

Solution :

Side length of square  =  3.60 m

Area of square  =  side x side

  =  3.60 x 3.60

  =  12.96 square meter

Problem 2 :

The weight of 1 bag of sugar is 12.5 kg. What is the weight of 15 such bags?

Solution :

Weight of 1 bag of sugar  =  12.5 kg

Weight of 15 such bags  =  15(12.5)

  =  187.5 kg

Problem 3 :

A vehicle covers a distance of 48.3 km in 2.3 litre of petrol. How much distance will it cover in 1 litre of petrol?

Solution :

Distance covered  =  48.3 km

Quantity of petrol used  =  2.3 liter

Distance covered using 1 liter of petrol  =  48.3/2.3

  =  21 liter

Problem 4 :

Ron has 3.60 l of juice. He pours it into 9 glasses equally. How much juice is there in each glass?

Solution :

Quantity of juice  =  3.60

Number of glasses  =  9

Quantity of juice in each glass  =  3.60/9

  =  0.4 l

Problem 5 :

Shelly has a ribbon of length 35.14 m. She cuts it into 7 equal parts. What is the length of each equal part?

Solution :

Length of ribbon  =  35.14 m

Number of equal parts  =  7

Length of each part  =  35.14/7

  =  5.02

So, length of each part of ribbon is 5.02.

Problem 6 :

The cost of 5 pens is $140.50. What is the cost of 1 pen?

Solution :

Cost of 5 pens  =  140.50

Cost of 1 pen  =  140.50/5

  =  28.1

So, cost of one pen is $28.1

Problem 7 :

The weight of a box is 150.094 kg. What will be the weight of 27 such boxes?

Solution :

Weight of one box  =  150.094 kg

Weight of 27 boxes  =  27(150.094)

  =  4052.538

Weight of 27 boxes is 4052.538 kg.

Problem 8 :

Sonia has 14.84 l of juice. She pours it into 7 jars equally. How much juice is there in each jar? 

Solution :

Quantity of juice  =  14.84 l

Number of jars  =  7

Quantity of juice in each jar  =  14.84/7

  =  2.12 l

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