Write each number in expanded form using exponents.

Question

Pls check
1, 234 (1*10^3)+(3*10^2)+(2×10^1)+4

210, 290, 450 (2*10^8)+(1*10^7)+(2*10^6)+(9*10^5)+(4*10^4)+5

7,123,456,089 (7*10^9)+(1*10^8)+(2*10^7)+(3*10^6)+(4*10^5)+(5*10^4)+(6*10^3)+(8*10^2)+(9*10^1)

Answer 1

10^3=1000
1,234*1000=1,234,000
10^2=100
3*100=300
2*10=20

1,234,000+300+20+1=1,234,321

I think this is what you do if I'm reading your problem correct.