Maths Teasers

[pinkee]

Can anyone help with the following maths questions please

98 (54) 64
84 (?) 36

4 9 20
8 5 14
10 3 ?


42 (41) 38
23 (?) 28

[grasscarp]

middle square answer is 11
4 to 8 is 4 and 8 - 10 drops 2 which is half
9 to 5 is 4 and 5 - 3 drops 2 which is half
20 to 14 is 6 so 14 drops 3 which is half

[pinkee]

Thanks grasscarp - any luck with the others?

[bibblebub]

1) 24?

multiply the leading digits of the numbers on each side, but with only one example to go by there could be numerous possibilities

[grasscarp]

with the last puzzle on the outside you have one number the same and the other one less. 4-3 and 2-2, and on the other side 3-2 and 8-8.
To do same with 41 you could end up with 40 - 4 -4 and 1-0 or 4-3 and 1 -1 which would be 31. or even 1-1 and 4-3 which is 13. I would go for 13 as this would make 2s 1s and 8s all different positions.

[pinkee]

That sounds incredibly complicated but thank you.

[grasscarp]

If you put lines joining the same numbers and the ones which go down by 1 you will see the pattern.