Question

16 kl -20dal =?l
8 dal-8 dl=?cl
4dl -10cl = ?ml
7hl -15dal=?l

Answer 1

$16kl-20dal=16000l-200l=\boxed{15800l} \\ \\ 8dal-8dl=8000cl-80cl=\boxed{7920cl} \\ \\ 4dl-10cl=400ml-100ml=\boxed{300ml} \\ \\ 7hl-15dal=700l-150l=\boxed{550l}$

Answer 2

16 kl = 1000 · 16 = 16 000 l
20 dal = 10 · 20 = 200 l
16 000 - 200 = 15 800 l

8 dal = 1000 · 8 = 8000 cl
8 dl = 10 · 8 = 80 cl
8000 - 80 = 7920 cl

4 dl = 100 · 4 = 400 ml
10 cl = 10 · 10 = 100 ml
400 - 100 = 300 ml

7 hl = 100 · 7 = 700 l
15 dal = 10 · 15 = 150 l
700 - 150 = 550 l