Common Factor

Q. Find the HCF of the following numbers.
(1) 45, 30 (2) 16, 48 (3) 39, 25 (4) 49, 56 (5) 120, 144
(6) 81, 99 (7) 24, 36 (8) 25, 75 (9) 48, 54 (10) 150, 225

Q. Two ropes, one 8 metres long and the other 12 metres long are to be cut into pieces of the same length. What will the maximum possible length of each piece be ?

Q. Write all the factors of the given numbers and list their common factors.
(1) 12, 16 (2) 21, 24 (3) 25, 30 (4) 24, 25 (5) 56, 72

Q. Find the largest number which is completely divisible by 28 and 42.

Q. Which of the following is the common factor of 16 and 24?

1. 6
2. 8
3. 12
4. 3

Q. Find the common factors of:
4, 8 and 12

Q.

Find the common factors of 35 and 50.

Q. How many common factors do 16 and 4 have?

Q.

Find the product. Write fractions in the simplest form.

$4.5(-5.26)$

Q. Find the common factors of : 56 and 120 [2 Marks]

Q. Find the common factors of:
35 and 50

Q. The fraction of rose plants in 10 gardens is given. The number of gardens that have 3/5 of plants as rose plants is

1. 5
2. 2
3. 3

Q.

Which of the following is a factor of 90 but not a factor of 75?

Q. The fraction of rose plants in 10 gardens is given. The number of gardens that have 3/5 of plants as rose plants is

1. 2
2. 3
3. 5

Q. Find the common factors of:
4, 6, and 16
(1 Mark)

Q. Find the common factors of:
4, 8 and 12

Q. A number when divided by $143$ leaves $31$ as remainder. What will be the remainder when the same number is divided by $13$?

1. $0$
2. $1$
3. $3$
4. $5$

Q. Three subway lines arrive at a station at the same time. Line P arrives at the station every 15 minutes, line Q arrives every 25 minutes, and line R arrives every 30 minutes. How long must one wait for all three lines to arrive at the station at the same time again?

1. 210 min
2. 90 min
3. 150 min
4. 120 min