Translation of "Sums" in Portuguese

It sums up the situation pretty well.

Isso resume muito bem a situação.

He's afraid to involve himself in paying large sums.

Ele temia comprometer-se a pagar grandes somas.

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

Ele não é inteligente o bastante para fazer contas de cabeça.