can someone help and tell me that ive done it right?

Two spinning tops are made using square pieces of cardboard with

matchsticks through the centre. One spinner has numbers 1, 2, 3, 4 on

each side of the square and the second spinner is made with numbers

5, 6, 7, 8. Draw a sample space diagram of all the outcomes of

spinning both tops. What is the probability that

(a) at least one number is odd

(b) the 2 numbers added together is 10

this is my solution....

(1st spin)

[1][2][3][4]

-------------

15 25 35 45 |5 (2nd spin)

16 26 36 46 |6

17 27 37 47 |7

18 28 38 48 |8

from the above diagram.

(a) 12/16 (at least one number is odd)

(b) 3/16 ( 2 numbers add up to ten)