CBSE Class 5 Mathematics Revision Worksheet Set 22

Q.1 Fill in the blanks.

Question (1). Every number is a multiple of __________.
Answer: itself
In simple words: Every number can be multiplied by 1 to get itself, making every number a multiple of itself.

Exam Tip: Remember that 1 and the number itself are fundamental in factors and multiples.

Question (2). The greatest 2 digit multiple of 3 is __________.
Answer: 99
In simple words: 99 is the largest 2-digit number and it is divisible by 3 (\(99 \div 3 = 33\)).

Exam Tip: Check divisibility by adding digits: \(9 + 9 = 18\), which is a multiple of 3.

Question (3). The number which are multiple of 2 are __________ called.
Answer: even numbers
In simple words: Numbers that are completely divisible by 2 are known as even numbers.

Exam Tip: Even numbers always end in 0, 2, 4, 6, or 8.

Question (4). The greatest 3 digit multiple of 2 is __________.
Answer: 998
In simple words: 999 is odd, so the next largest 3-digit number that ends in an even digit is 998.

Question (5). The number which are not multiple of 2 are __________ called.
Answer: odd numbers
In simple words: Numbers that leave a remainder of 1 when divided by 2 are odd numbers.

Exam Tip: Odd numbers always end in 1, 3, 5, 7, or 9.

Question (6). The number that are divisible by 1 and itself is called __________.
Answer: prime number
In simple words: A prime number has exactly two distinct factors: 1 and itself.

Exam Tip: Do not confuse prime numbers with composite numbers, which have more than two factors.

Question (7). Two factor of 6 are __________ and __________.
Answer: 2 and 3 (Note: Other valid answers include 1 and 6)
In simple words: The numbers that divide 6 completely without any remainder are 1, 2, 3, and 6.

Exam Tip: You can list any two correct factors from the set {1, 2, 3, 6}.

Question (8). 1, 3, 5, 7, 9 are __________ numbers.
Answer: odd
In simple words: These numbers cannot be divided evenly by 2.

Exam Tip: Single-digit odd numbers are 1, 3, 5, 7, and 9.

Question (9). __________ are divisible by 2.
Answer: Even numbers
In simple words: All even numbers are multiples of 2 and are divisible by 2.

Exam Tip: Look at the units digit to instantly test divisibility by 2.

Question (10). 0, 2, 4, 6, 8 are __________ numbers.
Answer: even
In simple words: These are the possible digits in the ones place of any even number.

Exam Tip: Zero is considered an even number because it is a multiple of 2 (\(0 \times 2 = 0\)).

Q-2 (A) Write first five multiple of the following.

Question (A)(1). 8
Answer: 8, 16, 24, 32, 40
In simple words: Multiply 8 by 1, 2, 3, 4, and 5 respectively.

Exam Tip: List the multiplication table of the given number up to 5 times.

Question (A)(2). 10
Answer: 10, 20, 30, 40, 50
In simple words: Count by tens up to five terms.

Exam Tip: Multiples of 10 always end in 0.

Question (A)(3). 12
Answer: 12, 24, 36, 48, 60
In simple words: Add 12 repeatedly: \(12, 12+12=24, 24+12=36\), etc.

Exam Tip: Knowing tables up to 12 helps solve this quickly.

Question (A)(4). 9
Answer: 9, 18, 27, 36, 45
In simple words: Write the first five products of 9.

Exam Tip: Notice the digit sum pattern in multiples of 9 always adds up to 9.

Question (A)(5). 11
Answer: 11, 22, 33, 44, 55
In simple words: Multiply 11 by 1, 2, 3, 4, and 5.

Exam Tip: Double digits from 11 to 99 (like 11, 22, 33) are easy multiples of 11.

Q-2 (B) Write three factor of the following.

Question (B)(1). 10
Answer: 1, 2, 5 (or any three factors from 1, 2, 5, 10)
In simple words: Numbers that divide 10 completely are 1, 2, 5, and 10.

Exam Tip: Always include 1 and the number itself as factors when applicable.

Question (B)(2). 8
Answer: 1, 2, 4 (or any three factors from 1, 2, 4, 8)
In simple words: The exact divisors of 8 are 1, 2, 4, and 8.

Exam Tip: List factors in pairs to avoid missing any: \(1 \times 8\) and \(2 \times 4\).

Question (B)(3). 32
Answer: 1, 2, 4 (or 8, 16, 32)
In simple words: 32 can be divided evenly by 1, 2, 4, 8, 16, and 32.

Question (B)(4). 21
Answer: 1, 3, 7 (or 21)
In simple words: The divisors of 21 are 1, 3, 7, and 21.

Exam Tip: Check divisibility by small prime numbers like 3 and 7.

Question (B)(5). 45
Answer: 1, 3, 5 (or 9, 15, 45)
In simple words: Factors of 45 include 1, 3, 5, 9, 15, and 45.

Exam Tip: Since 45 ends in 5, it is automatically divisible by 1, 5, and its digit sum (\(4+5=9\)) makes it divisible by 3 and 9.

Q.3 Write whether the following statements are true of false.

Question (1). 7 is a factor of 35.
Answer: True
In simple words: Since \(7 \times 5 = 35\), 7 divides 35 completely without a remainder.

Exam Tip: Verify by division: \(35 \div 7 = 5\).

Question (2). 4 is a smallest composite number.
Answer: True
In simple words: The numbers 1, 2, and 3 are not composite (1 is neither, 2 and 3 are prime), making 4 the first composite number with factors 1, 2, and 4.

Exam Tip: Composite numbers have more than two factors.

Question (3). 189 and 160 are coprime number.
Answer: True
In simple words: Two numbers are coprime if their only common factor is 1. The prime factors of 160 are 2 and 5, while 189 is not divisible by 2 or 5, so their greatest common divisor is 1.

Exam Tip: Check if they share any common prime factors.

Question (4). 1 is the smallest prime number.
Answer: False
In simple words: 1 is neither prime nor composite. The smallest prime number is 2.

Exam Tip: Remember that prime numbers must have exactly two distinct factors.

Question (5). 101 is the smallest 3 digit prime number.
Answer: True
In simple words: 100 is composite, and 101 cannot be divided evenly by any number other than 1 and 101, making it the first 3-digit prime.

Exam Tip: 101 is indeed the smallest 3-digit prime number.

Question (6). 405 and 392 are coprime number.
Answer: True
In simple words: 405 ends in 5 (factors are 3 and 5), while 392 is even (factors are 2), meaning they share no common prime factors other than 1.

Exam Tip: Coprime numbers do not need to be prime numbers themselves; their HCF just needs to be 1.

Question (7). 97 is greatest 2 digit composite number.
Answer: False
In simple words: 97 is a prime number, not a composite number. The greatest 2-digit composite number is 99.

Question (8). every number is a factor of it self.
Answer: True
In simple words: Every non-zero number divides itself with a quotient of 1 and a remainder of 0.

Exam Tip: This is a fundamental property of factors.

Question (9). 1 is a factor of every number.
Answer: True
In simple words: 1 divides every integer without leaving a remainder.

Exam Tip: 1 is the universal factor for all numbers.

Question (10). 98 is the greatest 2 digit composite number.
Answer: False
In simple words: 99 is larger than 98 and is also a composite number (\(9 \times 11 = 99\)). Therefore, 99 is the greatest 2-digit composite number.

Exam Tip: The highest 2-digit number overall is 99, and since it is composite, it holds the title of greatest 2-digit composite number.