We will discuss here how to solve the word problems on addition of decimal fractions.
We know to add two or more decimals:
(i) Convert all the decimals to be added into like decimals.
(ii) Write the decimals in column in such a way that the decimal pints of all the decimals are in the same column and the digits having the same place values are in the same column.
(iii) Add the decimal ignoring the decimal points.
(iv) Put the decimal point in the sum directly under the decimal points of all the decimals.
Solved examples on word problems
on addition of decimal fractions:
1. Find the sum of 12.279, 3.00046 and 742.000372.
2. The rain fall in a city during the months of July, August and September were 9.82 cm, 5.24 cm and 2.32 cm respectively. Find the total rainfall during three months.
Rainfall in July = 9.82 cm
Rainfall in August = 5.24 cm
Rainfall in September = + 2.32 cm
Therefore total rainfall = 17.38 cm
3. Mike walked 14.5 km on Monday, 12.75 km on Tuesday, 15.8 km on Wednesday and 18.6 km on Thursday. How many kilometres did Mahesh walk in 4 days?
Mike walked on
Mike walked on Monday = 14.50 km
Mike walked on Tuesday = 12.75 km
Mike walked on Wednesday = 15.80 km
Mike walked on Thursday = + 18.60 km
Therefore, total distance walked in four days = 61.65 km