Applying LCM and HCF
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Lesson details
Key learning points
- In this lesson, we will answer problem solving questions involving determining the lowest common multiple and highest common factor of two integers. We will model solutions to a range of problems including worded questions.
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4 Questions
Q1.
Find 28 as the product of its prime factors.
A
B
C
Q2.
True or False, Number A and B are 28 and 42?
False
Q3.
What is the HCF of 28 and 42?
B
C
D
Q4.
What is the HCF of 48 and 72?
12
14
32
Others
4 Questions
Q1.
Which number is missing from this prime factor tree?
16
6
7
Q2.
There are 30 cups in a packet. There are 12 plates in a packet. Amir buys exactly the same number of cups and plates. What is the smallest number of each packet Amir can buy?
2 packets of cups and 12 packets of plates
2 packets of cups and 3 packets of plates
4 packets of cups and 3 packets of plates
Q3.
What is the smallest number of identical squares that will fit in this rectangle?
360
3600
9
Q4.
The HCF of two numbers is 6. If the LCM is 42 find the two numbers. You could use a Venn diagram to help. I've started this one for you . . . can you finish it?
7 and 42
84 and 42
84 and 6