How can you tell when a pattern shows counting on by 10

If you see a zero that means that you are counting by 10s For example: 10,20,30,40,50,60,70,80

If you see a zero in the end of a number it might be counting on by ten, the hint is most likely the zero. Let's say you had a question like: 10_30. If you see the zero, you can make sense out of it and try the tens times table. So add ten to 10 and bam! You found your answer