HCF, LCM & Factorisation

HCF and LCM Worksheet-4

Mark against the correct answer:

1. Let N be the greatest number that will divide 1305, 4665 and 6905, leaving the same remainder in each case. Then sum of the digits in N is :

(a) 4                    (b) 5                    (c) 6                    (d) 8

2. The greatest number which can divide 1356, 1868 and 2764 leaving the same remainder 12 in each case, is :

(a) 64                  (b) 124                (c) 156                (d) 260

HCF and LCM Worksheet-5

1. Four different electronic devices make a beep after every 30 minutes, 1 hour, hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at :

(a) 12 midnight                             (b) 3 a.m.

(c) 6 a.m.                                        (d) 9 a.m.

2. A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting point?

(a) 26 minutes 18 seconds         (b) 42 minutes 36 seconds

HCF and LCM Worksheet-6

1. Find the LCM of 26 and 34.

(a) 234               (b) 446               (c) 442               (d) 421

2. Jay has a pack of cards. If he makes group of 3 cards or group of 8 cards or group of 12 cards, no card is left over. How many cards does he have in the pack?

(a) 24                  (b) 12                  (c) 16                  (d) 21