#### description

• Grid model
• Area model
• Place value grid model

#### notes

To add the decimal numbers we can add them as whole numbers but the decimal will remain at the same place as it was in the given numbers. It means that we have to line up the decimal point in each number while writing them, and then add them as a whole number.

0.35 + 0.42 = 0.77
 Ones Tenths Hundredths + 0 3 5 + 0 4 2 0 7 7

∴ 0.68 + 0.54 = 1.22

 Ones Tenths Hundredths + 0 6 8 + 0 5 4 1 2 2

#### Example

 Thousands Hundreds Ones Tenths Hundredths Thousandths Ten Thousandths 1 0 6 7 0 8 0 + 0 9 4 3 0 1 0 6 8 0 2 3

#### Example

 Ones Tenths Hundredths Thousandths 1 5 0 0 + 5 0 0 6 6 5 0 6

#### Example

Rahul bought 4 kg 90 g of apples, 2 kg 60 g of grapes and5 kg 300 g of mangoes. Find the total weight of all the fruits he bought.

Weight of apples = 4 kg 90 g= 4.090 kg

Weight of grapes = 2 kg 60 g = 2.060 kg

Weight of mangoes = 5 kg 300 g = 5.300 kg

Therefore, the total weight of the fruits bought is

 4.090 kg + 2.060 kg + 5.300 kg 11.450 kg

The total weight of the fruits bought = 11.450 kg.

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