Solution:

86,888

Solution:

4.

The number in every row indicates the number of crossed lines in every shape

Solution:

12111

Explanation:
11000 + 1100 + 11 => 12111

Solution:

The answer is shown in the below picture

Solution:

==== 65 ==== 35 ====
== 34 === 31 === 4 ==
= 10 == 24 == 7 == -3 =

Solution:

7 Trips

Explanation:
Send 2+5+9 = 16
Bring back 9
Send 3+4+9 = 16
Bring back 9
Send 1+7+8 = 16
Bring back 1
Send 1+6+9 = 16

Solution:

2 Ways

Explanation:
1 + 2 + 34 + 56 + 7 = 100.
1 + 23 + 4 + 5 + 67 = 100.

Solution:

Zouma is 3 and has two footballs.
Ake is 1 and has one football.
Kalas is 4 and has three footballs.
Aina is 2 and has four footballs.

Solution:

8/(1−1/5)

Solution:

707

Explanation:
Square of 707 = 70499849
4+9+9+8+4+9 = 43