© Oxford University Press 2024
NEW ENJOYING MATHEMATICS 2024 ED. BOOK 5
lp savani
practice
Teacher's Copy
Marks: 49
General Instructions:
READ THESE INSTRUCTIONS FIRST If you have been given an Answer Booklet, follow the instructions on
the front cover of the Booklet. Write your name, class, section and roll number clearly on your answer
sheet. Answer all the questions. Read each question carefully before answering it.
True or False( 2 X 1 = 2 )
1)State whether true or false.
(a) If a number is divisible by 6, it is also divisible by 3.
(b) All numbers divisible by 3 are even numbers.
(c) If a number is divisible by 4, it is also divisible by 2.
(d) Some numbers divisible by 5 are odd numbers.
Correct Answer:
(a) True
(b) False
(c) True
(d) True
2)State whether true or false.
a) If a number is divisible by 10, it is also divisible by 5.
b) All numbers divisible by 9 are odd numbers.
c) If a number is divisible by 4, it is divisible by 8.
d) All the numbers divisible by 11 are odd numbers.
Correct Answer:
a) True
b) False
c) True
d) False
Long answer questions( 2 X 4 = 8 )
1)Susheel is organising his study table. He has 16 red crayons and 12 blue crayons. He wants to put them
into mugs of equal numbers of crayons but with each mug having only one colour of crayon. What is the
largest number of crayons he can have in one mug?
Correct Answer: Susheel can put 1 or 2 or 4 crayons in every mug, such that each mug has only one
colour. So, the largest number of crayons he can have in one mug will be 4 crayons.
2)The craft teacher has 12 sheets of blue chart paper and 18 sheets of red chart paper. How many equal
piles of chart paper can she make such that each pile has only one colour?
Correct Answer: She can make piles of 1 or 2 or 3 or 6 chart papers each such that each pile has only one
colour.
Short answer questions( 5 X 2 = 10 )
1)Complete the table.
Correct Answer:
2)Complete the HCF chart. Some are done for you.
Correct Answer:
3)Complete the table.
Correct Answer:
4)Complete the table.
Correct Answer:
5)Complete the table.
Correct Answer:
Fill in the blanks( 2 X 1 = 2 )
1 a) A number is divisible by 6 when ________.
b) ________ is the only even prime number.
c) Factors of 31 = _______.
d) HCF of 13 and 23 is _______.
Correct Answer:
a) It is divisible by both 2 and 3
b) 2
c) 1, 31
d) 1
2)a) HCF of 17 and 19 = _______.
b) Prime factors of 67 are _______.
c) HCF of 4 and 5 is 1, so HCF of 40 and 50 is _______.
d) Prime factors of 27 are _______.
Correct Answer:
a) 1
b) 1, 67
c) 10
d) 3, 3, 3
Solve( 9 X 3 = 27 )
1)Find the HCF using prime factorisation.
(a) 18, 24
(b) 16, 56
(c) 13, 24, 86
(d) 42, 72, 6
Correct Answer:
(a) 6
(b) 8
(c) 1
(d) 6
2)Find the HCF of these numbers using the prime factorisation method.
(a) 10, 14
(b) 20, 5
(c) 10, 30
(d) 24, 36
Correct Answer:
(a) 2
(b) 5
(c) 10
(d) 12
3)Use prime factorisation to find the prime factors of these composite numbers.
a) 18
b) 44
c) 63
d) 56
Correct Answer:
a) 2 × 3 × 3
b) 2 × 2 × 11
c) 3 × 3 × 7
d) 2 × 2 × 2 × 7
4)Use prime factorisation to find the prime factors of these composite numbers.
a) 28
b) 65
c) 27
d) 70
Correct Answer:
a) 2 × 2 × 7
b) 5 × 13
c) 3 × 3 × 3
d) 2 × 5 × 7
5)Use Question 8 to find the common factors of the following:
a) 10, 16
b) 10, 30
c) 16, 30
Correct Answer:
a) CF: 1, 2
b) CF: 1, 2, 5, 10
c) CF: 1, 2
6)Use prime factorisation to find the prime factors of these composite numbers.
a) 21
b) 70
c) 80
d) 36
Correct Answer:
a) 3 × 7
b) 2 × 5 × 7
c) 2 × 2 × 2 × 2 × 5
d) 2 × 2 × 3 × 3
7)Circle the numbers divisible by
(a) 4:236 7089 1996 6000 13488
(b) 6:678 890 4377 9966 14782
(c) 8:6734 8960 670 8520 78923
(d) 11:676 3046 7821 9954 66575
Correct Answer:
(a) 236, 1996, 6000, 13488
(b) 678, 9966
(c) 8960, 8520
(d) 7821
8)Find the factors of the following:
a) 10
b) 16
c) 30
Correct Answer:
a) 1, 2, 5, 10
b) 1, 2, 4, 8 ,16
c) 1, 2, 3, 5, 6, 10, 15, 30
9)Find the prime factors in each of the following.
(a) 48
(b) 39
(c) 50
(d) 87
Correct Answer:
(a) 2, 2, 2, 2, 3
(b) 3, 13
(c) 2, 5, 5
(d) 3, 29
