5th grade
posted by
tre on
.
name each number in two different ways 90,000,000
40,000

Math 
PsyDAG,
Ninety million or 9*10^8 (nine times ten to the sevenh power)
forty thousand or 4*10^5 (four times ten to the fourth power)
I hope this helps. Thanks for asking.

5th grade 
Nina,
900 times 100,000 or 9,000 times 10,000.