C.
e.
16, 13, 41, 27, 54, 51, 2, 73, 87, 89, 61, 69
3. Fill in the blanks.
The prime number just less than 35 is
b. The prime factors of 70 are 5,
and
There are
prime numbers between 1 and 100.
d. The smallest composite number is
The composite number just greater than 50 is
f. 5 X 2 X 3 X 3 is the prime factorisation of
g. The prime factorisation of 16 is
4. Find the prime factorisation of the following numbers using the factor tree method.
b. 48
c. 75
d. 69
e. 72
f. 81
5. Find the prime factorisation of the following numbers using the division method.
b. 71
C. 55
d. 90
e. 64
f. 84
a. 56
a. 65
TESTS OF DIVISIBILITY
et us recall the divisibility tests that we have learnt in Class 4.
number is said to be divisible by 2, 5, or 10 only if it follows the ruleggiven in the
Divisibility by
Rule
Answers
Answer:
Step-by-step explanation:
a. Prime no. just less than 35 is 31
b. Prime factors of 70 are 2 x 5 x 7
c. There are 25 prime numbers between 1 and 100
d. 4 is the smallest composite number
e. 52
f. 90
g. 2 x 2 x 2 x 2
4. 48 75 69 72
/ \ / \ / \ / \
2 24 5 15 3 23 2 36
/ \ / \ / \
2 12 3 5 3 12
/ \ / \
3 4 3 4
/ \ / \
2 2 2 2
81
/ \
3 27
/ \
3 7