New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 5 Factors & Multiples Self Practice 6A Solution
Self Practice 6A
1)
a) Factors of 13 = 1,13
It is a prime number.
b) Factors of 28 = 1, 2, 4, 7, 14, 28
It is a composite number.
c) Factors of 36 = 1, 2, 3, 4, 6, 9, 12, 18, 36
It is a composite number.
d) Factors of 19 = 1, 19
It is a prime number.
e) Factors of 37 = 1,37
It is a prime number.
f) Factors of 65 = 1, 5, 13, 65
It is a composite number.
3)
a) Common multiples of 9 and 12 is 36
b) Common multiples of 4 and 12 is 12, 24, 36
c) Common multiples of 4, 9 and 12 is 36
d) As per the diagram, I want to write 108 in the ‘T’ region.
4)
a) 225 = 3 x 3 x 5 x 5
b) 160 = 2 x 2 x 2 x 2 x 2 x 5
c) 90 = 2 x 3 x 3
d) 1080 = 2 x 2 x 2 x 3 x 3 x 3 x 5
5)
a) Common factor
20 = 1, 2, 4, 5, 10, 20,
and 35 = 1, 5, 7, 35
HCF is 5
b) Common factor
18 = 1, 2, 3, 6, 9, 18
and 27 = 1, 3, 9, 27
HCF is 9
c) Common factor
28 = 1, 2, 4, 7, 14, 28
and 42 = 1, 2, 3, 6, 7, 14, 21,, 42
HCF is 14
d) Common factor
24 = 1, 2, 3, 4, 6, 8, 12, 24
32 = 1, 2, 4, 8, 16, 32
and 48 = 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
HCF is 8
6) HCF by Prime factorisation method
a) 42 and 60 = 6
b) 18, 36 and 44 = 2
c) 36, 48 and 60 = 12
d) 28, 48 and 56 = 4
7) HCF by Long division method
a) 84 and 90 = 6
b) 160 and 144 = 16
c) 465 and 945 = 45
8) LCM by prime factorisation method
a) 32 and 48 = 96
b) 30 and 56 = 840
c) 60 and 90 = 180
9) LCM by Division method
a) 4, 16, 20 = 80
b) 16, 28 and 46 = 2576
c) 39, 45 and 54 = 3510
d) 25, 40, 80, 100 = 400