Respuesta :

christinann062
3.9 x 5.3 = 20.67 

im not really sure how i would show my work while typing, but if you really need to see it i could insert a picture, let me know. 
apologiabiology
I use the expansion distributive thing

remember a(b+c)=ab+ac
3.9=4-0.1
3.9 times 5.3=
(4-0.1) times 5.3=
5.3(4-0.1)=
5.3(4)+5.3(-0.1)=
(5+0.3)4+5.3(-0.1)=
20+1.2-0.52=
20+0.68=
20.68
taht's one way