To check divisibility by 12, we check that
Number is divisible by 3
Number is divisible by 4
Divisibility by 3
Sum of digits = 1 + 0 + 9 + 2
= 12
Since 12 is divisible by 3
∴ 1092 is divisible by 3
Divisibility by 4
Last two digits = 92
Since 92 is divisible by 4
∴ 1092 is divisible by 4
To check divisibility by 12, we check that
Number is divisible by 3
Number is divisible by 4
Divisibility by 3
Sum of digits = 6 + 4 + 8
= 18
Since 18 is divisible by 3
∴ 648 is divisible by 3
Divisibility by 4
Last two digits = 48
Since 48 is divisible by 4
∴ 648 is divisible by 4
To check divisibility by 12, we check that
Number is divisible by 3
Number is divisible by 4
Divisibility by 3
Sum of digits = 5 + 2 + 4
= 11
Since 11 is not divisible by 3
∴ 524 is not divisible by 3
Divisibility by 4
Last two digits = 24
Since 24 is divisible by 4
∴ 524 is divisible by 4
Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.
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