14. Number Theory 2 Talk About


Puzzler


What is the only factor that is common to both 18 and 25? Find the HCF of 8 and 12. What is the third multiple of 3? What is the eighth multiple of 2? What is the LCM of 5 and 25? What is the LCM of 9 and 12? Now write down each of the answers in sequence. What is the pattern?


Square Numbers The number 4 can be arranged into exactly the same number of rows as columns.


2 × 2 = 4


1. Which of the following numbers can be arranged into the same number of rows and columns?


9 18 25 36 42 16


Numbers that can be arranged into exactly the same number of rows and columns are called square numbers. What is the fi rst square number?


We know that a square centimetre can be written as cm2 be written as 22


. Strand: Number


Curriculum Objectives: Identify and explore square numbers; explore and identify simple square roots; write whole numbers in exponential form.


101 . So 4, which is 2 × 2, can


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