Respuesta :

8*8=64
70*8= 7*8*10=56*10=560
90*8= 9*8*10=72*10=720
90*70=9*7*100=63*100=6300
6300+64+560+720= 7644

Answer:

8*8=64

70*8= 7*8*10=56*10=560

90*8= 9*8*10=72*10=720

90*70=9*7*100=63*100=6300

6300+64+560+720= 7643 or 7644

Step-by-step explanation:

Took my a little while