LCM lesson
Presentation
•
Mathematics
•
7th Grade
•
Practice Problem
•
Easy
Maria Woodbury
Used 2+ times
FREE Resource
3 Slides • 5 Questions
1
Lowest common multiple (hiding numbers)
By Maria Woodbury
2
LCM
Write both numbers as a product of prime numbers
Then
Write the first number,
and add what is missing from the second number
12 = 2 x 2 x 3
15 = 3 x 5
The lowest common multiple is 2 x 2 x 3 x 5
3
Your turn!
What is the lowest common multiple of 21 and 32?
Step 1: 21 = 32 =
Step 2:
4
Match
Match the first three multiples to the numbers given
5
2
10
8
7
5, 10, 15
2, 4, 6
10, 20, 30
8, 16, 24
7, 14, 21
5, 10, 15
2, 4, 6
10, 20, 30
8, 16, 24
7, 14, 21
5
Categorize
24
36
48
72
84
96
108
30
45
75
90
105
120
135
Add the multiples to the correct numbers
6
Multiple Choice
The HCF of 12 and 15 would be
7
Multiple Choice
The LCM of 12 and 15 would be
8
Poll
I am confident to
Find HCF and LCM
Finding HCF at this stage
Finding LCM- I forgot what HCF was
doing factor trees
Lowest common multiple (hiding numbers)
By Maria Woodbury
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