October 21, 2019

# Subject :Mathematics Primary 6 First Term

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

* point out multiples of numbers

*write out common multiples of numbers

*solve simple mathematics questions on 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

Or

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

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