Day Three Try these. Lowest Common Multiple


Step 2: Identify the lowest multiple that both numbers have in common.


Example: Find the lowest common multiple of 3 and 4. Multiples of 3: 3, 6, 9, 12, 15, 18 … Multiples of 4: 4, 8, 12, 16, 20 …


Answer: The lowest common multiple of 3 and 4 is 12.


Highest Common Factor Step 1: List the multiples of both numbers. Step 1: List the factors of both numbers.


Step 2: Identify the highest number that divides evenly into both numbers.


Example:


Find the highest common factor of 27 and 36. F27 = (1, 3, 9, 27) F36 = (1, 2, 3, 4, 6, 9, 12, 18, 36)


Answer: While 27 and 36 have other common factors, 9 is the highest.


1 Find the lowest common multiple of 20 and 25. Answer: 2 What is the highest common factor of 16 and 32? Answer: 3 Work out the lowest common multiple of 2, 9 and 12. Marks: /2 Marks: /2


Answer: 4 Add the highest common factor of 15, 45 and 60 to 72 Answer: Puzzle power


All of the answers in today’s tasks can be written in exponential form. Write these answers again, this time in exponential form.


1. 90 2 2. 4 3. 2 4. 3 Today’s Marks: /8 . Marks: /2


Marks:


/2


Week 21 | Number Theory


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