Ineed someone to tell me what to do in these, i have no clue how to get it.

To convert a decimal to a fraction, we simply "add as many zeros to the denominator as there are decimals, and lose the dot", what the dickens does that mean?

well, let's see, notice in this case, the radicand has 4 decimals, so we'll use 4 zeros to make it a fraction, and lose the dot,



as for the other one

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)