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Question
Write first five multiples of 5.
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Solution
5 × 1 = 5,
5 × 2 = 10,
5 × 3 = 15,
5 × 4 = 20,
5 × 5 = 25
Thus, the first five multiples of 5 are 5, 10, 15, 20 and 25.
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State, true or false:
If a divide b and c completely, then a divides
(i) a + b
(ii) a – b
also completely.
Write down the factors of 20.
The factors of a number are 1, 2, 4, 5, 8, 10, 16, 20, 40 and 80. What is the number?
Complete the multiplication chart given here.
Look at the green boxes in the chart. These show how we can get 12 by multiplying different numbers.
12 = 4 × 3, so 12 is a multiple of both 4 and 3. 12 is also a multiple of 6 and 2, as well as 12 and 1. We say 1, 2, 3, 4, 6, 12 are factors of 12.
