Translation of "Sums" in Finnish

Where large sums of money are concerned, it is advisable to trust nobody.

Kun on kyse isoista rahasummista, niin on suositeltavaa olla luottamatta keneenkään.

- He doesn't have enough brains to do sums in his head.
- He doesn't have a head for numbers.
- He's not smart enough to work it out in his head.
- He's not smart enough to add numbers in his head.

Hänellä ei ole päätä päässälaskuun.

- He doesn't have enough brains to do sums in his head.
- He isn't smart enough to do mental arithmetic.
- He isn't smart enough to add up numbers in his head.
- He's not smart enough to add numbers in his head.

Hän ei ole tarpeeksi fiksu laskeakseen lukuja yhteen päässään.