It is a matter of elementary school level, but even adults can enjoy it altogether.
Do you think it is easy? Please try the ultra challenge at the bottom.
It leads to child's intellectual development, adults' killing time, elderly brain activation.
Since problems (4 cards) are displayed randomly, besides easy problems,
Super challenges and problems that can not be calculated come out.
Completely charge-free !!!
Using four numbers once, using the four arithmetic calculation (+, -, ×, ÷) method,
Make an answer "24" by mental arithmetic.
Super challenge · 1, 5, 5,
· 1, 4, 5, 6
· 3, 3, 8, 8
...