Here we use the scientific notation to express multiple-figure numbers, instead of writing them out with lots of zeros, for example, 2 zeros, 3 zeros, 6 zeros, or 9 zeros for 1 hundred(1x10^2), 1 thousand(10^3), 1 million(10^6), or 1billion(10^9) respectively. And here we also use the multiplication rule of exponents to evaluate the problem, such as {Ax(a^m)}x{Bx(a^n)} = AxBx{a^(m+n)}, e.g. {6x(10^2)}x{8x(10^3)} = 6x8x{10^(2+3)} = 48x(10^5) = 4.8x(10^1)x(10^5) = 4.8x(10^6) (= 4.8 million)
In scientific notation, the given numbers are written as follows: 100 billion = (10^2)x(10^9) = 10^11, and 2 thousand = 2x(10^3) So, 100 billion x 2 thousand = (10^11)x2x(10^3) = 2x(10^14)
While, one trillion is written in scientific notation as follows: one trillion = 10^12
Therfore, 100 billion x 2 thousand = 2x(10^14) = 2x(10^2)x(10^12) = 200x(10^12) = 200 trillion
Answer: 100 billion x 2 thousand = 200 trillion (= 2 hundred trillion)
CK: 100 billion x 2 thousand = {100x(10^9)} x {2x(10^3)} = 200x(10^9)x(10^3)** = 200x(10^12) = 200 trillion CKD
** Note: 1 thousand = 1x10^3, 1 thousand x 1 thousand = 1 million (=1x10^6), 1 million x 1 thousand = 1 billion (=1x10^9), 1 billion x 1 thousand = 1 trillion (=1x10^12), 1 trillion x 1 thousand = 1 quadrillion (=1x10^15), so 400 billion x 22 thousand = 8,800 trillion = 8.8 x 1 thousand x 1 trillion = 8.8 quadrillion = 8 quadrillion 800 trillion