🧑‍🤝‍🧑 / 🏡 Is this a left brain / right brain thing? I see this puzzle with two ways to solve...

[TerryP]

...and both hit me before I got to 8x8.

 

[It Takes Eleven]

72 jumps out at me.

 

[TerryP]

72 jumps out at me.

That's the answer. How did you get the result?

 

[It Takes Eleven]

That's the answer. How did you get the result?

I just looked at it and quickly saw that the solution came from adding a factor to the true product. 3x3=9 + 3 = 12, 4x4 = 16 + 4 = 20, and so forth.

 

[rick4bama]

I got the same 72. @It Takes Eleven that how I did it too. And no I didn't read any of the post on here first.

 

[alabama mike]

I just looked at it and quickly saw that the solution came from adding a factor to the true product. 3x3=9 + 3 = 12, 4x4 = 16 + 4 = 20, and so forth.

That’s what I did as well.

 

[Krimson]

That’s what I did as well.

Same

 

[TerryP]

I just looked at it and quickly saw that the solution came from adding a factor to the true product. 3x3=9 + 3 = 12, 4x4 = 16 + 4 = 20, and so forth.

I did it that way: the second time.

I saw 3X3 = 12 and thought, "change the last three to four" and I have 12. Change the four to five, I've got 20. I was done.

THEN it hit me that 4X4+4 brought the same result.

I can't call the first solution math, can I? Changing the numbers to make it work...worked, but it's not what your maths instructors are going to teach.