NCERT Class 6 Solutions: Knowing Your Numbers (Chapter 1) Exercise 1.2 – Part 3

The following table shows the SI system of units:

 Text Symbol Factor Power exa E 1000000000000000000 1018 peta P 1000000000000000 1015 tera T 1000000000000 1012 giga G 1000000000 109 mega M 1000000 106 kilo k 1000 103 hecto h 100 102 deca da 10 101 (none) (none) 1 100 deci d 0.1 10−1 centi c 0.01 10−2 milli m 0.001 10−3 micro μ 0.000001 10−6 nano n 0.000000001 10−9 pico p 0.000000000001 10−12 femto f 0.000000000000001 10−15 atto a 0.000000000000000001 10−18

For example, there are 100 cm in a meter and there are 1000 meters in a km

Following diagrams illustrate the long division:

Q-9 To stitch a shirt 2 m 15 cm cloth is needed. Out of 40 m cloth, how many shirts can be stitched and how much cloth will remain?

Solution:

Therefore, 18 shirts can be stitched and 130 cm (1 m 30 cm) cloth will remain.

Q-10 Medicine is packed in boxes, each weighing 4 kg 500 g. How many such boxes can be loaded in a can which cannot carry beyond 800 kg?

Solution:

The weight of one box

Maximum load that the van can take

Therefore, number of boxes

Hence, maximum 177 boxes can be loaded in the van. 3500 g or 3.5 kg capacity will be left

Q-11 The distance between the school and a student’s house is 1 km 875 m. Every day she walks both ways. Find the total distance covered by her in six days.

Solution:

Distance between school and house

Now,

Therefore,

Distance between school and home

Distance between home and school

Total distance covered in one day (going to school and coming back)

Therefore, distance covered in 6 days

Therefore,

Q-12 A vessel has 4 liters and 500 ml of curd. In how many glasses each of 25 ml capacity, can it be filled?

Solution:

• Capacity of curd in a vessel

• Capacity of one glass

• Number of glasses can be filled