1.5 children shake hands, once per person, how many times do you shake hands?

Answer: 10 times. The first child shakes hands with four children, the second child shakes hands with three children, the third child shakes hands with two children, the fourth child shakes hands with 1 child, and the fifth child shakes hands for one round, so there is no need to shake hands again, so the formula is 4+3+2+ 1 = 10 (times).

Xiaoming went to grandma's house to pick apples. Xiaoming greedily ate three big red apples, and there were six left in the box. How many apples did Little Yi Ming pick?

Answer: 9.

My brother has 6 apples, my sister has 5 apples and my brother has 8 apples. After my brother gave my brother 1 apple, my brother ate 3 apples. Who has the most apples at this time?

Answer: My brother has the most apples. Six younger brothers, five older brothers and five older sisters.

4.7+6=7+( )+( )= 10+( )=( )

8+7=8+( )+( )= 10+( )=( )

7+9=7+( )+( )= 10+( )=( )

6+8=6+( )+( )= 10+( )=( )

Answer: (3)(3)(3)( 13)

(2)(5)(5)( 15)

(3)(6)(6)( 16)

(4)(4)(4)( 14)