Across

1 1 down minus 177
4 1 across plus thirty-one
7 9 across plus twenty-nine
8 Five times 27 across
9 Four times 18 down
10 11 across minus thirty-six
11 5 down plus forty
13 17 across plus 3521
15 13 across minus 800
17 1 down plus twenty-one
20 6 down minus ninety-nine
23 16 down divided by eight
24 A square number
25 24 across times three
27 A square number
28 A prime number
29 Two times 8 across
30 17 across minus ninety

Down

1 2 down times 28 down
2 A prime number
3 Three times 8 across
4 1 across minus 624
5 2 down minus twenty-three
6 Two times 29 across
10 Four times 24 across
12 25 across plus eighteen
14 30 across divided by eleven
16 6 down divided by five
17 1 across minus 280
18 23 across minus thirty-five
19 13 across plus 570
20 29 across plus 104
21 Six times 24 across
22 20 across plus eighteen
26 10 down plus sixteen
28 28 across plus one