## Answer :

so you could use a calculator

or

400,000,001=400,000,000+1 so

300 times 400,000,001=(300 times 400,000,000) plus (300 times 1)

400,000,000 times 300= (3 times 4=12, count the zeros and add them togethter)=120,000,000,000

300 times 1=300

300+120,000,000,000=120,000,000,300