math
15x27
405
what is full of holes but still holds water
a sponge
120x15
1800
what do you throw out when you want to use it, but take in when you don’t want to?
an anchor
167+1670
1837
take one out and scratch my head, i once was black but now i’m red, what am i?
a match
2+2
4
i come from a mine and always get surrounded by wood, everyone uses me. what am i?
pencil lead
5+963+927
1895
what disappears as soon as you say its name?
silence
20+45
65
how can the number 4 be half of five?
IV
(100-50)x14-576
124
what are the next three letters in this combination
OTTFFSS
ENT