HCF and LCM Questions for Class 7
1.
State whether the following statements are
true or false.
a.
The number of factors of 54 are 8.
b.
The product of two numbers is equal to the product of their HCF and LCM.
c.
The numbers 512 and 945 are coprime.
d.
Three clocks chime at interval of 15, 20 and 30 minutes. If they chime together
at 1 p.m., then they will chime together again at 2 p.m.
2.
Choose the correct option.
a.
The LCM of 18, 27 and 36 is
i. 9
ii. 540
iii. 36
iv. 108
b.
The HCF and LCM of two numbers are 3 and 105 respectively, then the two-digit
numbers satisfying the above condition is
i. 15 and 21
ii. 3 and 105
iii. 9 and 35
iv. 45 and 71
c.
The least number which when divided by 12, 18 and 30 leaves the same remainder
5 is
i. 180
ii. 3
iii. 185
iv. 6
3.
Match the following to the correct answer.
a.
The greatest prime factor of 195 is i. 4
b.
The least composite number is ii. 1
c.
The number which is neither prime nor composite is iii. 13
d. The greatest number which divides
each of two or
more numbers exactly is termed as iv. xy
e. If two numbers
x and y are coprime, then their LCM is v. HCF
4. The HCF of two numbers 185 and 2750 is 5, find their LCM.
5.
Find the HCF and LCM all of the following
numbers by factor method.
a. 16, 18, 24, 36, 40
b.
48, 20, 64, 90, 50
6.
Find the least number which when divided by
15, 24, 32 and 36 leaves remainder 9.
7.
Find the greatest number that will divide 811,
1317 and 1984 leaving remainder 6 in each case.
8.
Find the greatest number that exactly divides
48, 144 and 168.
9.
Find the greatest number that will divide 3035
and 2610 leaving a remainder 33 and 3 respectively.
10.
Is it possible for two numbers to have 35 as
their HCF and 430 as their LCM? Give reasons to support your answer.
11.
State true or false.
a.
The HCF of two coprime numbers is 1.
b.
Multiples of 7 are 7, 14, 21, 28, 35 etc.
c.
LCM of 12, 21 and 36 is 420.
d.
Product of HCF and LCM of two numbers is equal to the quotient of the two
numbers divided.
e.
LCM of two composite numbers is always greater than their HCF.
12.
Choose the correct option.
a.
The prime factors of 1001 are
i. 7, 11 and 13
ii. 3, 7, 11
iii. 3, 11, 13
iv. 3, 7, 13
b.
The number which is coprime with 39 is
i. 24
ii. 42
iii. 35
iv. 30
c.
The least even number divisible by 13 is
i. 39
ii. 26
iii. 35
iv. 52
d.
The HCF of 32, 48 and 280 is
i. 8
ii. 140
iii. 24
iv. 6
13.
Fill in the blanks.
a.
HCF of coprime numbers is ___________.
b.
HCF and LCM of two numbers are respectively 32 and 192. If one number is 96,
then the other is ___________.
c.
A number which is exactly divisible by 5 has __________ or __________ in the ones
place.
d.
The least number which is a multiple of 12 and 15 is ___________.
e.
756 on factorizing and writing in exponent form is written as ___________.
14.
Find the LCM of 540, 5157 and 2052.
15.
Find the HCF of the following using division
method.
a. 324, 576 and 1080
b. 180, 250 and
684
16.
Find the greatest missing digits so that the
following numbers are divisible by 9.
a. 3 ___ 7
b. ___ 99
c. 6 ___ 7653
17.
Find the least number of sweets necessary to
be distributed equally among 25, 30 or 35 children.
18.
Find the greatest number which divides 256,
928 and 1376 exactly.
19. Find the minimum number of square tiles required to pave the floor
of a room whose measurement is 2 m 10 cm × 1 m 68 cm.
20. Three drummers beat their drums at intervals of 4 seconds, 12
seconds and 16 seconds respectively. After what time will they again beat
together if they had started beating together?
21. Find the least number which when decreased by
8 is divisible by 96, 192 and 216.
22.
Crossword Puzzle
Across
3.
The product of two integers of different signs is always ________.
4.
LCM of two numbers is always exactly divisible by their ________.
5.
1 is a ________ of every number.
7.
Every improper fraction can be written as a ________ fraction.
9.
On subtracting 1 from a number, we get ________ of the number.
10.
Two natural numbers which do not have a common prime factor are called
________.
11.
_________ value of an integer is its numerical value regardless of its sign.
12.
1 is known as the multiplicative ________ for integers.
13.
________ is neither prime nor composite.
Down
1. Prime numbers differing by two are
called ________.
2. On adding 1 in a number, we get its
_______.
6. The set of numbers denoted by Z is
_______.
8. Additive
property shown by (a + b) + c = a + (b + c)
is ________.
ANSWERS
HCF and LCM Questions for Class 7 Answers
1. a. True b. True
c. True d. True
2. a. iv b. i
c. iii
3. a. iii b. i
c. ii d. v
e. iv
4. 1,01,750
5. a. HCF = 2; LCM = 720
b. HCF = 2; LCM = 14400
6. 1449
7. 23
8. 24
9. 79
10. No; because 430 is not divisible by 35.
11. a. True b. True
c. False d. False
e. True
12. a. i b. iii
c. ii d. i
13. a. 1 b. 64
c. 5; 0 d. 60
e. 22 × 33
× 7
14. 1959660
15. a. 36 b. 2
16. a. 8 b. 9
c. 0
17. 1050 sweets
18. 32
19. 20 square tiles
20. 48 seconds
21. 1736
22. Crossword Puzzle
Across: 3. Negative
4. Sum
5. Factor 7.
Mixed
9. Predecessor 10. Coprime
11. Absolute 12. Identity
13. One
Down: 1. Twin primes
2. Successor 6. Integers
8. Associative
MCQs Questions for Class 7 Maths
 |
| Maths Worksheets for Other Chapters of Class 7 |
1. Integers questions for class 7
3. Fraction questions for class 7
4. Decimals class 7 worksheets
5. Exponents and powers class 7 worksheet
6. Rational numbers class 7 worksheet
7. Algebraic expressions worksheet for class 7
8. Linear equations class 7 worksheet
9. Ratio and proportion class 7 worksheet
10. Percentage worksheet for class 7
11. Profit and loss class 7 worksheet
12. Simple interest worksheet for class 7
13. Lines and angles class 7 worksheets
14. Triangle and its properties class 7 worksheets
15. Congruence of triangles class 7 worksheets
16. Symmetry worksheet for class 7
17. Constructions worksheet for class 7
18. Perimeter and area class 7 worksheets
19. Data handling class 7 worksheet
Some Extra Worksheets for ICSE Maths Class 7
1. Sets Class 7 ICSE Worksheets
|
| Maths Worksheets for Other Classes |