12 minus 63 plus 9 is -42
12 + 15 + 63 + 12 + 24 + 34 + 23 + 15 = 198
63 + (12 x 15) = 63 + 180 = 243
6 plus 6 plus 63 plus 63 plus 36 plus 36 is equal to 210.
309?
50 + 63 + 72 + 63 + 137 + 172 = 557
X = √63
63 + 63 = 126
8+8+8+8+8+8+8+8=64 or 8*8=64
If you are meaning 12/63, 3 can go into both (a good trick is to add the digits separately 1+2=3 and 6+3=9, if the answer is a multiple of 3 then 3 goes into it) So therefore 4/21 is 12/63 simplified.
24 plus 63 is equal to 87.
The answer is 262. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.