Q: What is the units digit of the sum 0 till 100?

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105 is the sum

24

Add the last digit (units digit) to twice the previous digit (tens digit). If this sum is divisible by 4, so is the original number.

Seven of them.

46

Related questions

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.

"If the units digit and the hundreds digit of the number 513 were reversed..." 315 'find the sum of the original number and the new number." 513+315=828

105 is the sum

105 is the sum

-4

24

Add the last digit (units digit) to twice the previous digit (tens digit). If this sum is divisible by 4, so is the original number.

When the units digit equals the tens digit then the sum of the digits of a 2 digit number is double the units digit. In each tens range above 50, numbers below this critical point meet the requirement, numbers above this critical point have a sum LESS than double the units digit. The applicable numbers are 51-54 (4), 61-65 (5), 71-76 (6), 81-87 (7) and 91-98 (8). Then there are 4 + 5 + 6 + 7 + 8 = 30 qualifying numbers.

31

46

Seven of them.

There is no number. 100 is the only one that has a hundreds digit. It's impossible.