A David is watching Maria and Alma race electric trains around a track. Maria's train
can go around the track in 10 seconds. Alma's train can go around the track in
12 seconds. David wonders, if the trains start at the same time, how many
seconds will it take for both trains to cross the finish line together the first time?
Part A
Complete the explanation for how David can answer his question. Use words and
phrases from the box to fill in the blanks.
greatest common factor least
factors least common multiple
multiples
greatest
David needs to find the _ _of 10 and 12. To find this, he could list
of both 10 and 12 and circle each number that appears in both
lists. He should then identify the
_number that is circled in both lists.
Part B
How long will it take for both trains to cross the finish line together the first time?
Answer:
seconds​