Learning Task 2: Solve the following problems using the 4-step plan. Use the
concept of LCM in each problem. Write your answer in your notebook.
1. A lighthouse 1 flashes its light every 15 minutes. A lighthouse 2 flashes
every 18 minutes. If the two lighthouses flash together at 1:00 A.M, what
time they will next flash together?
2. The length and width of rectangular lot are 108 m and 144 m. Trees are
planted at equal distance along the sides of the lot. What is the total number
of trees planted?
3. Leo visits the regional office once every 2 days. Ethan visits once every 4
days while Jaypee visits once every 6 days. They all meet one day in the
office. After how many days will they meet together again at the Regional
Office?
4. The box of candies is shared equally among 9,12, or 18 children, there are
always 6 candies left. Find the smallest number of candies in the box?
5. Three bells toll at intervals of 12 min, 20 min, and 24 min, respectively. If they start by ringing together, after how long will they all ring again?
Answers
Answer:
1.GIVEN:light house 1 flashes its light every 15 minutes
A light house 2 flashes every 18 minutes.
ASKED:time they will next flash together?
OPERATION: repeted division
ANSWER: 2:30 am is the time they will next flash together
2.GIVEN:length and width of rectangular lot are 108m and 144m
ASKED: the total numbers of trees planted
OPERATION:repeated division
ANSWER: 432 is the total numbers of trees planted
3.GIVEN:leo visit the regional office once every 2 days. Ethan visit once every 4 days while.jaypee visit once every 6 days.
ASKED:how many days will they meet again at the regional 0ffice
OPERATION:repeated division
ANSWER:after 12 days is the day,they will meet again at the regional 0ffice
4.GIVEN:box of candies is shared equally amon
ASKED:find the smallest numberof candiesin the box
OPERATION:repeated division
ANSWER:42 is the smallest number of candies in the box
5.GIVEN:Three bells toll intervals of 12 min,20 min,and 24 min
ASKED:how long will they ring again?
OPERATION: repeat division
ANSWER:the LCM of 12,14,24 is equal to 120