# Using Decimal Number as Units

• Decimals in money
• Decimals in length measurement
• Decimals in weight measurement

## Notes

### Using Decimal number as units:

#### 1. Decimals in money:

We know that 100 paise = Rs. 1.

Therefore, 1 paise = Rs.  1/100 = Rs. 0.01.

#### 2. Decimals in length measurement:

10 millimetre(mm) = 1 centimetre(cm)

100 centimetre(cm) = 1 metre(m)

1000 millimetre(mm) = 1 metre(m)

1 Kilometr e (Km) = 1000 metre(m)

1 centimetre(cm) = 1/(100) "m" or 0.01 "m"

#### 3. Decimals in weight measurement:

We know that 1000 g = 1 kg

Therefore, 1 g = 1/(1000) kg = 0.001 kg.

## Example

Express as rupees using decimals.

65 paise

65 paise = Rs. 65/100 = Rs. 0.65

## Example

Express as cm using decimals.
7 cm and 5 mm

7 cm and 5 mm

= 7 cm + 5/10cm

= 7 5/10

= 7.5 cm

## Example

Express as metres using decimals.
5 m and 875 mm

5 m and 875 mm

= 5 + 875/1000

= 5 875/1000

= 5.875 m.

## Example

Express as metres using decimals.
5 m and 20 cm

5 m and 20 cm

= 5 + 20/100

= 5 20/100

= 5.20 m

## Example

Express as kg using decimals.

2350 g

2350 g

= 2000 g + 350 g

= 2000/1000 "kg" + 350/1000 "kg"

= 2 kg + 0.350 kg

= 2.350 kg

i.e. 2350 g = 2 kg 350 g = 2.350 kg.

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Using Decimal Numbers to Combine Units [00:15:38]
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