Lets use the distributive property and to this...
Fist 8×53 might be hard so lets break it to (50×8)+(3×8)
⇒400+24
⇒424
And we still have the 125 whcih we have to multiply with 424
Here again we do it the same way but its more packed with steps.
424×125
⇒[(400×100+400×25)+(20×100+20×25)+(4×100+4×25)]
⇒[(40000+10000)+(2000+500)+(400+100)]
⇒[(50000)+(2500)+(500)]
⇒50000+2500+500
⇒50000+3000
⇒53000