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Subject : Mathematics Class : Class 6
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the biggest number that can be used with these digits is formed when using biggest digit as most significant place so it 876543. However we're asked to find biggest number divisble by 5. You may recall that a number is divisble by 5 if last digit of that number is either 5 or 0. (If you dont know it, try to learn these tricks for 2, 3, 5 etc, thay can come handy)
so we need to make this number divisible by 5 and to make that we need to end it 5 by placing 5 at the unit place, so number is 876435.