252
1827
7x9=63
5 minus 63 = -58 5 times 63 = 315
2/7 of 63 means 2/7 x 63. Multiply 2 x 63, then divide the result by 7. You may also divide 63 / 7 first, then multiply by 2 - in this case it is simpler, because it is divisible, and results in smaller numbers for the intermediate calculations.
63 and 3
7, 3, and -3.
189
Numbers you can multiply to get 126 are: 2 x 63 3 x 42 6 x 21 7 x 18 9 x 14
There are infinitely many numbers divisible by 63, just multiply 63 by any whole number and you'll get one.
63
47