Usually to make numbers bigger you have to hit the little plus sign then hit another number
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Try multiplying or raising to a power. Addition works too but is slower.

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Should just be in the kcalc settings and set your font preference (including size)
Everybody is saying “raise them to a power” or “add to them”.
No one realizes you can just push “c” twice and type different numbers that are as big as you like!
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