GCF & LCM Word Problems

Melanie and Martin are both building a toy train track out of connecting pieces. Melanie has pieces that are 8 inches long while Martin's pieces are 20 inches long.  How long will the shortest track be that they can each build with the same length?

• 2
• 40
• 4
• 20

Two neon signs are turned on at the same time. Both signs blink as they are turned on. One sign blinks every 9 seconds. The other sign blinks every 15 seconds. In how many seconds will they blink together again?

• 48 seconds
• 45 seconds
• 16 seconds
• 8 seconds

Which are factor pairs of 45?

• 1,45,5,9

• 1,3,7,9

• 5,7,8,9

• 7,9,5,2

Tags

CCSS.4.OA.B.4

•The HCF of X and Y is M. Which of these is true?

• M > X

• M > Y

• M = XY

• M < X

Three bells toll together at the same time after the first bell stays quiet for 12 seconds, the second bell for 15 seconds and the third bell for 18 seconds. During a duration of 30 minutes, how many times will the three bells toll together?

• 10

• 11

• 12

• 15