Question

3×10^4 to expanded notation​

Answer 1

$\\ \sf\longmapsto 3(10^4)$

$\\ \sf\longmapsto 3(10)(10)(10)(10)$

$\\ \sf\longmapsto 3(10000)$

$\\ \sf\longmapsto 30000$

Done

Answer 2

3 *10^4=3*10000=30000