222 because 222+222=444 and 444/2=222
To achieve a sum of 9 in all directions on a grid using the numbers 222, 333, and 444, you can place them strategically. For example, place 222 in the center, 333 in one direction, and 444 in the opposite direction, ensuring that the adjacent numbers complement each other to total 9 when combined. Since the numbers are relatively large, consider using smaller numbers or a different approach, as 222, 333, and 444 alone cannot add up to 9 in any combination.
I am not sure if any two consecutive numbers can add up to an even number.
There are no two prime numbers in which a product of 100 is possible.
A one and two zeros
19 and 1
These two sets together make up the set of real numbers.
97 + 2
2 and 1021
83 + 2
342 234 423
Hard question
4 and 9.