State the divisibility rule for 4. Using divisibility test, determine which of the following numbers are divisible by 4?
(a) 4096 (b) 21084 [3 MARKS]

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Solution

A number is divisible by 4 if the last two digits of the whole number are divisible 4. [1 Mark]
(a) Since number formed by tens and units digit is 96, which is divisible by 4. Hence, 4096 is divisible by 4. [1 Mark]
(b) Since number formed by tens and units digit is 84, which is divisible by 4. Hence, 21084 is divisible by 4.
[1 Marks]

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