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Using Decimal Number as Units

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Topics

description

  • 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 + `5/10`cm

= `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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Shaalaa.com | Using Decimal Numbers to Combine Units

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