What is the least common multiple (LCM) of 4 and 10?
4
40
15
20
11. Multiple Choice
1 minute
12 pts
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
12. Multiple Choice
30 seconds
12 pts
Jenny goes to dance class every 6 days, karate class every 12 days, and to the library every 18 days. On December 1st she went to both classes and the library. On what date will she do both classes and go to the library?
24 days
36 days
42 days
52 days
13. Multiple Choice
30 seconds
12 pts
The school cafeteria serves tacos every sixth day and cheeseburgers every eight day. If tacos and cheeseburgers are both on today’s menu, how many days will it be before they are both on the menu again?
14 days
24 days
34 days
44 days
14. Multiple Choice
30 seconds
12 pts
Peter has 18 oranges, 27 pears and 12 bananas. He wants to make fruit baskets with the same number of each fruit in each basket. How many PEARS will be in the greatest number of fruit baskets?