You canwrite 5.73 billion as 5,730,000,000.
write 573 thousandths in expanded form
5.73
DLXXIII
500 × 70 × 3
I write 620 billion as 620 billion.
0.573 = 573/1000
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.
573 = (5 x 102) + (7 x 101) + (3 x 100)
573/1000 or 0.573
You can write 40.3 billion as 40,300,000,000.
You can write out 1.8 billion as "1,800,000,000" or "one billion eight hundred million."