Question

cinco centenas + quatro dezenas =​

Answer 1

540

Centenas = 100 . 5 = 500

dezenas = 10 . 4 = 40

Answer 2

Lembramos que:

$\boxed{\begin{array}{lr} \large \sf Cinco\:centenas\: \:igual\to500\end{array}}$

Mais

$\boxed{\begin{array}{lr} \large \sf Quatro\:dezenas\:\:igual\to40\end{array}}$

Somando:

$\sf 500+40=\boxed{\boxed{\sf 540}}$

Bons estudos =)