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Gcf Lcm Word Problems
1.
GCF and LCM
& Problem Solving Definition of HCF and LCM. How can you tell if a word problem requires you to use Greatest Common Factor or Least Common Multiple to solve?
2.
Prime Factors Tuesday
5 October 2010 Objective Write a number as a product of its prime factors. Find the HCF and LCM of two numbers © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
3.
12 ÷ 2
= 6 12 ÷ 3 = 4 12 ÷ 6 = 2 12 can be divided by 2, 4 and 6 so 12 is not a prime number. 7 ÷ 7 = 1 7 ÷ 1 = 7 Prime Numbers A prime number is a number that can only be divided (exactly) by itself and 1. 7 can only be divided by itself and 1 to give an integer answer. 7 is a prime number © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
4.
Write down the
prime numbers between 1 and 40. © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
5.
Factors Factors are
the numbers that multiply together to give a certain number. The factor pairs of 12 are: 1 x 12 = 12 2 x 6 = 12 3 x 4 = 12 4 x 3 = 12 6 x 2 = 12 12 x 1 = 12 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
6.
The prime factors
of 12 are: 2 x 2 x 3 = 12 12 2 6 3 2 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
7.
Find the Highest
Common Factor (HCF) of 36 and 72 1. Find the prime factors of both numbers 36 = 2 x 2 x 3 x 3 72 = 2 x 2 x 2 x 3 x 3 2. Use one of each of the numbers that are in both lists HCF = 2 x 2 x 3 x 3 HCF = 36 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
8.
Find the Lowest
Common Multiple (LCM) of 36 and 90 1. Find the prime factors of both numbers 36 = 2 x 2 x 3 x 3 90 = 2 x 3 x 3 x 5 2. Use one of each of the numbers that are in both lists and all the remaining numbers. LCM = 2 x 3 x 3 x 2 x 5 LCM = 180 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
9.
1. Find the
HCF of 12 and 30. 2. Find the HCF of 54 and 180. 3. Find the LCM of 18 and 30. 4. Find the LCM of 24 and 84. 5. Find the LCM of 54 and 120 6. Find the LCM of 72 and 150 1. 6 2. 18 3. 90 4. 168 5. 1080 6. 5600 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
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