1 Mark Question

Questions

6 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark

Write the tables of the given numbers and find their LCM. : 5, 6, 15

Answer

Multiples of 5 : 5, 10, 15, 20, 25, 30, 35
Multiples of 6 : 6, 12, 18, 24, 30, 36
Multiples of 15 : 15, 30, 45, 60
∴ LCM of 5,6 and 15 = 30

Question 21 Mark

Write the tables of the given numbers and find their LCM. : 8, 12

Answer

Multiples of 8 : 8, 16, 24, 32, 40
Multiples of 12 : 12, 24, 36, 48
∴ LCM of 8 and 12 = 24

Question 31 Mark

Write the tables of the given numbers and find their LCM. : 6, 7

Answer

Multiples of 6 : 6, 12, 18, 24, 30, 36, 42
Multiples of 7 : 7, 14, 21, 28, 35, 42, 49
∴ LCM of 6 and 7 = 42

Question 41 Mark

Which are the even prime numbers ?

Answer

Question 51 Mark

List the prime numbers from 25 to 100 and say how many they are.

Answer

29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97. There are 16 prime numbers from 25 to 100.

Question 61 Mark

Which number is neither a prime number nor a composite number ?

Answer

1 Mark Question - Maths STD 7 Questions - Vidyadip

Maths 1 Mark Question