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  10^{18} 
peta  P  1000000000000000  10^{15} 
tera  T  1000000000000  10^{12} 
giga  G  1000000000  10^{9} 
mega  M  1000000  10^{6} 
kilo  k  1000  10^{3} 
hecto  h  100  10^{2} 
deca  da  10  10^{1} 
(none)  (none)  1  10^{0} 
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:
Q9 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.
Q10 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
Q11 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,
Q12 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