154637

For these question I tried using trial and error.
The first flashcard said 'The sum of 3 numbers is odd'. I think this statement is only sometimes true because I tried many different calculations. At first, I thought that this statement was false because my first try was-1+2+3=6. However, I then tried 42+51+61=154, this equation showed that this statement was sometimes true.
The second flashcard said 'A multiple of 5 end in 5'. This statement too is only sometimes true because the multiples of 5 are-5,10,15,20,25,30,35,ei. Multiples of 5 include numbers which also end in 0.
The third question said 'If you add a multiple of 10 to a multiple of 5 you get a multiple of 5. This I think is always true because a multiple of 10 will also be a multiple of 5 . Here is a example of what I am trying to say- 70+35=105(multiple of 5),30+25=55(multiple of 5),ie.
The forth question said 'If you add a 1 to an odd number then the answer will be an even number. I think this is always true because odd and even numbers alternate in turn so if 1 is add to an odd number the next number has to be an even number.
The fifth question states ' If you add two odd numbers you get an odd number'. I think this statement is always false because if you add any odd number with another odd number it is always even. I know this because I used trial and error to come to this conclusion.