Question 9 :
HCF of co-prime numbers 4 and 15 was found as follows by factorisation :$4 = 2 \times 2 and 15 = 3 \times 5$ since there is no common prime factor, so HCF of 4 and 15 is 0. Is the answer correct? If not, what is the correct HCF?
Question 10 :
Find the least number which when divided by 6, 15 and 18 leave remainder 5 in each case
Question 11 :
Determine the smallest 3-digit number which is exactly divisible by 6, 8 and 12.
Question 12 :
Find the smallest 4-digit number which is divisible by 18, 24 and 32.
Question 14 :
The length, breadth and height of a room are 825 cm, 675 cm and 450 cm respectively.Find the longest tape which can measure the three dimensions of the room exactly.
Question 22 :
Renu purchases two bags of fertiliser of weights 75 kg and 69 kg. Find the maximum value of weight which can measure the weight of the fertiliser exact number of times
Question 23 :
Determine the greatest 3-digit number exactly divisible by 8, 10 and 12
Question 24 :
Three tankers contain 403 litres, 434 litres and 465 litres of diesel respectively. Find the maximum capacity of a container that can measure the diesel of the three containers exact number of times.
Question 25 :
State True or False for the following statement:
When a number is a factor of other number then their LCM will be the larger number.
Question 26 :
The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m., at what time will they change simultaneously again?
Question 27 :
Three boys step off together from the same spot. Their steps measure 63 cm, 70 cm and 77 cm respectively. What is the minimum distance each should cover so that all can cover the distance in complete steps?
