HCF and LCM Worksheet-6

HCF and LCM Worksheet-6

1. What is the smallest 3-digit number that is divisible by 18, 36 and 45?

(a) 160                (b) 360               (c) 140                (d) 180

2. Albert, Rohan and Robin step off together for their school. Their steps measure 60 cm, 75 cm and 90 cm respectively. What is the minimum distance each should walk so that all can cover that distance in complete steps?

(a) 100 cm         (b) 900 cm        (c) 600 cm        (d) 750 cm

3. The least common multiple of 80, 85 and 90 is _____.

(a) 12,240          (b) 7,200           (c) 6,810            (d) 16,420

4. What is the LCM of 4 and 17?

(a) 17                  (b) 171                (c) 71                   (d) 68

5. The smallest number, which when divided by 18, 108 and 144 leaves a remainder of 1 in each case _____.

(a) 420               (b) 433               (c) 400               (d) 480

6. Find the least common multiple of 6 and 18.

(a) 108               (b) 180               (c) 18                  (d) 186

7. Help Kate in finding the smallest 3- digit number, which is exactly divisible by 8, 12 and 16.

(a) 122                (b) 144                (c) 120                (d) 160

8. 120 is the smallest 3-digit number which exactly divisible by _____.

(a) 12, 16 and 32                           (b) 18, 20 and 30

(c) 6, 8 and 12                               (d) 36, 45 and 60

9. David is calculating the LCM of 9 and 4. Which number will he get as a result?

(a) 72                                              (b) 36

(c) 49                                              (d) Can not be determined

10. The smallest number, which when divided by 15, 20 and 48, leaves 9 as a remainder in each case, is ____.

(a) 240               (b) 420               (c) 480               (d) 249

Answer Key:

1. (d)
2. (b)
3. (a)
4. (d)
5. (b)
6. (c)
7. (b)
8. (c)
9. (b)
10. (d)