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Wittgenstein on mathematical propositions

What does Wittgenstein mean when he says  ”In life it is never a mathematical proposition which we need, but we use mathematical propositions only in order to infer from propositions which do not belong to mathematics to others which equally do not belong to mathematics. ” ?
gpt
“Whereof one cannot speak, thereof one must be silent.” 

Think of a drum set that’s missing the snare drum, so you use a trash can lid in its place. Essentially, mathematics is a way to interpret or conceptualize kinds of data, but it is always a substitution for the data itself. We use it to make sense of the world around us in the best way we can, though it doesn’t complete the world around us or necessarily provide us with the snare drum to complete the drum set. It’s more like the trash can lid that works AS the drum, but isn’t actually itself the drum.