I see a problem with this simple math, cp.

What to do with children without fingers? How do they know what number to use when figuring out what number must be added to 13 to get to 15? If they do not know how to subtract 13 from 15, how do they know to use 2? With fingers it is easy, you just keep adding a finger until you get to 15, then count how many fingers you added. I guess maybe they can use toes?

Yes, we are coming to the end of all things. There is a separation taking place. Those who depend upon the wisdom of man and those who look to God for their wisdom. Pity the poor children.