Explain how u could use the distributive property and mentel math to find 5*198

Mental math

I know that

x times 5 = (10x) / 2

basically, to multily something by 5, divide it by 2 then multily it by 10

198/2=99

times 10

990

I think the distribitive peroperty part is

198=200-2

so

remember

a (b-c) = ab-ac

so

5 (200-2) =

(5) (200) - (5) (2) =

1000-10=

990