Question

PRIMUL EXERCITIU 9 dam=? m 100 cm =? m AL DOILEA EXERCITIU 536-90+70-300+1000 Al TREILEA EXERCITIU APROXIMATI NR 300 10 SI 400

Answer 1

$\bold{1.} \ 9 \ dam=\boxed{90 \ m}; \\ \ \ \ \ \ 100 \ cm=\boxed{1 \ m}. \\ \bold{2.} \ 536-90+70-300+1000=446+70-300+1000= \\ =516-300+1000=216+1000=\boxed{1216}.$
$\bold{3.} \ 300 \approx 500; \\ 10 \approx 1; \\ 400 \approx 500.$