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Tuition Singapore Secondary Math Tuition – Factors and Multiples
Tuition Singapore Secondary Math Tuition – Factors and Multiples
1. We can write a whole number greater than 1 as a product of two whole numbers.
E.g. 18 = 1 x 18
18 = 2 x 9
18 = 3 x 6
1, 2, 3, 6, 9 and 18 are called factors of 18.
2. Factors of a number are whole numbers which multiply to give that number.
3. The common factors of two numbers are the factors that the numbers have in
E.g. Factors of 12: 1,,2, 4, 6, 12
Factors of 21: 1,3,, 7, 21
The common factors of 12 and 21 are 1 and 3.
4. When we multiply a number by a non-zero whole number, we get a multiple of the
number.
E.g. 1 x 3 = 3 1 x 5 = 5 2 x 3 = 6 2 x 5 = 10 3 x 3 = 9 Multiples of 3 3 x 5 = 15 Multiples of 5 4 x 3 = 12 4 x 5 = 20 5 x 3 = 15 5 x 5 = 25 The multiples of 3 are 3, 6, 9, 12, 15, … and
the multiples of 5 are 5, 10, 15, 20, 25, …
5. The common multiple of two numbers is a number that is a multiple of both
numbers.
E.g. Multiples of 4 are 4, 8,12, 16, 20, 24, 28, 32,36, …
Multiples of 6 are 6,12, 18, 24, 30, 36, …
The first three common multiples of 4 and 6 are 12, 24 and 36.
Please contact Angie @ 96790467 or Mr Ong @ 98639633 if you need tuition on Lower Secondary Math
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