ABCDE * 4 = EDCBA

As soon as we got online and connected, Lucas said: “Can I show you something?”

“Sure”, I replied.

He brought up TextEdit and started typing, and explained: “I encountered a problem in our math class which is similar to what we played before. It looked like ABCDE * 4 = EDCBA with A, B, C, D and E each being a digit.”

21978 * 4 = 87912

“Do you want me to show how it holds?”he continued, “Here is the vertical form”.

2 1 9 7 8
*       4
__________
8 7 9 1 2

Then I realized that yes we did write a small piece of code together to search solutions of a similar math problem a few months ago.

Ah ha, I’ll challenge other kids with this one. Stay tuned. ;-)

所有跟帖： 

• 我是这样做的：） -yddad- ♂ (960 bytes) () 10/06/2019 postreply 19:37:41

• 赞！-：） -有言- ♂ (0 bytes) () 10/06/2019 postreply 19:59:50

• still need to consider B=0 -swfhx2019- ♂ (0 bytes) () 10/07/2019 postreply 07:37:00

• 可以这样排除0 -yddad- ♂ (117 bytes) () 10/07/2019 postreply 08:34:24