the unit digit is the last digit from left or ones digit
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84.42 or 42.21
Power 2: units digit 9. Multiply by 49 again to get power 4: units digit 1. So every 4th power gives units digit 1. So 16th power has units digit 1, so the previous power, the 15th must have units digit 3.
The digit in the units column of the number 7157 is 7.
It is the unit's digit of the product of the unit's digits. For example, the units digit of 123456 * 4689 is simply the units digit of 6*9 = 54, which is 4.
The units digit of a two digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10.