write this number in standard form: 40,000,000,000?

you write

4 x 10¹º

notice that the second 10 is smaller and raised

40,000,000,000 as you have it written is already in standard form. To put it into scientific form, however, you would want to count the zeroes after the 4 (there are ten), so your answer is:

4 x 10^10.

Forty Billion

0.01%of1billion=?

For standard form, count the number of zeroes, and that is your exponent.
40,000,000,000 has 10 zeroes, so write 4x10¹º

For scientific notation, this would be 40 Giga bytes... or whatever units (since giga is 1,000,000,000)

40,000,000,000
= 4 x 10^10

4x10^10

4x10(to the power of 10)

:)