Does anybody here know the metric system?

Kilometers   1000m   10³
hectometer   100m     10²
decameter    10m       10¹
standerd       1m          10

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)