The number of 20 is useless. 14 people are playing hide-and-seek and there are 6 people outside. Our minds will soon think that there are still eight people hiding, but the current primary school questions are very, very test our understanding ability. Don't forget, there is another child looking for someone, so the correct solution formula should be

14-6- 1=7 people

Extended data

Add two numbers with the same sign, use the same sign as the addend, and then add the absolute values.

Add two numbers with different signs, and if the absolute values are equal, the sum of two numbers with opposite numbers is 0; If the absolute values are not equal, take the sign of the addend with the larger absolute value and subtract the smaller absolute value from the larger absolute value.

Two opposite numbers add up to 0. Adding a number to 0 still gets this number. You can add two opposite numbers first.

Numbers with the same sign can be added first. Numbers with the same denominator can be added first. If several numbers can be added to get an integer, they can be added first.