If the division N ÷ 2 leaves no remainder (i.e, zero remainder), what might be the one’s digit of N?
Suppose that the division N ÷ 5 leaves a remainder of 4 and the division N ÷ 2 leaves a remainder of 1. What must be the one’s digit of N?
∵ N 5 and remainder = 4
∴ One's digit can be 4 or 9
Again N 2 and remainder = 1
∴ N must be an odd number.
Thus, one's digit can be 9 only.
Check the divisibility of the following number by 9.
1. 108 2. 616 3. 294
4. 432 5. 927