Question

Alisha has three roll of streamers to use in
decorating the school gym for a dance
competition. The red roll is 42 m long, yellow
roll is 49 m long and the green roll is 63 m
long. She wants to cut the roll into strips of equal
length and have no material left over. What is
the greatest length of each strip?​

Answer 1

lcm denotes least common multiple by taking lcm of 42 , 49 and 63 we get the answer 882

now for geatest length of each strip

divided 882/42=21

882/49=18

882/63=18

the largest length is 21

Answer 2

Answer:

The answer is 7m because 42,49,63 are in the table of 7.