Learn addition of unlike decimals in the following steps:

Step 1: Convert unlike decimals to like decimals.

Step 2: Write addends one below the other in such a way that decimal point and digit of same place values should be at same vertical order or same place value

Step 3: Add the digits as we add digit in case of whole numbers

Step 4: Decimal Point of addends and Sum should be at same vertical order or same place.

Example - Let's try to understand the following example by adding 1.1 and 6.66

Solution: Steps for addition are as follows:

Step 1: Convert unlike decimals to like decimals
Decimal 1.1 and 6.66 are Unlike Decimals, because:
1.1 have only one decimal place i.e. digit 1
6.66 have two decimal places i.e. digit 6 and 6

Now, 1.1 can be converted into a decimal having two decimal places i.e. by adding 0(Zero) at its hundredths place.

And after conversion we get;
1.10 having two decimal places i.e. digit 1 and 0

Now, 1.10 and 6.66 are Like Decimals because both have similar decimal places.

Step 2: Write addends one below the other in such a way that decimal point and digit of same place values should be at same vertical order or at same place value and we get:

1.10
6.66

Step 3: Add the digits as we add digit in case of whole numbers and we get:

1.10

6.66

7 76

Digits at hundredths place are added and we get: 0 + 6 = 6
6 is written in the sum at same place value.

Digits at tenths place are added and we get : 1 + 6 = 7
7 is written in the sum at same place value.

Digits at ones place are added and we get : 1 + 6 = 7
7 is written in the sum at same place value.

Step 4: Decimal Point of add ends and Sum should be at same vertical order or at same place and we get:

1.10

6.66

7.76

Hence, on adding decimals 1.1 and 6.66 we get decimal 7.67

Study More Solved Questions / Examples

Add the following unlike decimals -
A) 8.34 and 6.8
B) 18.456 and 28.9
C) 64.785 and 9.72
D) 17.28, 54.9 and 0.005
E) 52.005, 50.5 and 23.02

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