Number Puzzle

[fireflybob]

What number should replace the question mark?

9 7 8 5
3 1 4 3
8 8 7 6
2 2 3 ?

Thanks for any help!

[torgy]

I think its 4 firefly

[fireflybob]

torgy, thanks but why?

[mirandasmum]

4 if you add the numbers going down its 22 18 22 18

[wallacia]

could the number 4,
9-3=6,8-2=6,7-1=6,8-2=6,8-4=4,7-3=4,5-3=2,so by logic it should be 6-4=2

[fireflybob]

Thanks to all

[torgy]

also numbers across add up to
29
11
29
with a 4 also 11

[wallacia]

also 9785-3143=6642
8876-2234=6642

[factor-fiction]

Also each 2 x 2 block of 4 numbers adds up to 20. Starting from the top:
9+7+3+1
7+8+1+4
8+5+4+3
3+1+8+8
1+4+8+7
4+3+7+6
8+8+2+2
8+7+2+3
7+6+3+? so ?=4