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2|180
2|90
3|45
3|15
5|5
|1

2|450
3|225
3|75
5|25
5|5
|1
HCF = 2² x 3² 52

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2 | 180.    2 | 450
2 | 090.    3 | 225
3 | 045.    3 | 075
3 | 015.    5 | 025
5 | 005.    5 | 005
001.         001

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Q2: Find the largest whole number that is a factor of both 156 and 168

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1(f) Find HCF of 64 and 81

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1(d) Find HCF of 180 and 450

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1(c) Find HCF of 126 and 240

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1(b) Find HCF of 13 and 91

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1(a) Find HCF of 12 and 30

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There are 6 questions in total.
1. You shall attempt the question that is assigned to you first.
2. Take a CLEAR photo of the working and answer.
3. Post it in the assigned column.
4. You should attempt the rest of the questions as a practice to improve your procedural fluency.

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Source: Textbook Exercise 1C (p25)

Express each number in INDEX NOTATION before determining the Highest Common Factor (HCF).

Note: Do not leave your final answer in index notation unless you are told to do so.