Subject : Mathematics
Topic : Lowest Common Multiple (LCM)
Ref. Book : Understanding Mathematics Book Six, Ugo C. Ugo,.
Behavioural Objectives : At the end of the lesson, pupils should be able to
*recite multiples of numbers
* write out multiples of numbers
*write out common multiples of numbers
*write out the lowest common multiple of any given set of numbers
Instructional materials : Lagos state scheme of work for year six.
Understanding Mathematics Book Six.
Wall charts on multiples of Numbers,Abacus
Content : Multiples of numbers are also known as products of numbers. They are the answers that we get when we multiplied two figures by each other. Therefore we can say that the second multiple of 8 is 16 (8❌2=16)
Write out the first five multiples of seven = 7, 14, 21, 28, and 35
Write out the first six multiples of 2=2, 4, 6, 8, 10, and 12
We may calculate the LCM of numbers by writing out the common multiples of the given figures or by dividing the figures by prime numbers
Question 1. Calculate the LCM of 3 and 4
Solution: write out the multiples of the given figures to 12rh position
3= 3, 6, 9, 12,15, 18, 21, 24, 27, 30, 33, 36,
4= 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48
Common multiples of 3 and 4 are 12, 24,and 36
Lowest common multiple of 3 and 4 is equal to 12
we can equally solve the question by dividing the given figures repeatedly by prime numbers like this
Presentation : The topic is presented step by step
Step 1: The teacher revises the previous topics.
Step 2: The teacher introduces the new topic.
Step 3: the teacher allows the pupils to give their own contributions and he corrects then when the needs arise.
Evaluation : Calculate the LCM of the following figures
Conclusions : He does the necessary corrections and he goes round to mark