Page 181 - Math_Genius_V1.0_C4_Flipbook

E:\Working\Focus_Learning\Math_Genius_4_(25-10-2023)\Open_Files\Chap-10
\\December 11, 2023 5:25 PM Bharat Arora P-6 Reader _________________________ Date: ___________________74

Other units for Measuring Lengths

Inch, foot, yard, mile, etc. are the other units which

are used commonly for measuring length. Quick Check
Mostly, we tell our heights in feet and inches. What is your height?

For example, Raman is 4 feet 6 inches tall. We write
‘ft’ for 'foot' and feet.

Look at the ruler given below:

0 cm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Units in centimetres

0 1 2 3 4 5 6 Units in inches

We can see that one side of the ruler measures length in centimetres (cm) and the
other side measures in inches (in).
Think and Answer
12 inches make 1 foot.

1 foot = 12 inches or 12 inches (in) = 1 foot (ft) List the objects
whose lengths can be
example 5: Convert the following: measured in inches.

(a) 3 ft 4 in into in (b) 28 in into ft and in

Solution: (a) We have, 1 foot = 12 inches
Therefore, 3 ft = 3 × 12 in = 36 in

3 ft 4 in = 36 in + 4 in = 40 in

(b) We have, 12 in = 1 ft
To convert inches to ft, we will divide by 12.

Therefore,

12 28 2 Quotient
24
4 Remainder

Here, the quotient becomes feet (ft) and the remainder becomes inch (in).
So, 28 in = 2 ft 4 in

Practice time 10a

1. Convert the following into cm.

(a) 63 m (b) 150 m (c) 16 m 40 cm (d) 30 m 5 cm

2. Convert the following into mm.

(a) 29 cm (b) 180 cm (c) 16 cm 3 mm (d) 25 cm 8 mm

Mathematics-4 179