Use scientific notation.
9 x 10^10 times 2 x 10^2 = 18 x 10^12
Eighteen trillion
200 million times 7.4 billion is 1,480,000,000,000,000,000.
200 million times 7 billion is: 1,400,000,000,000,000,000 (1.4 quintillion).
25 billion trillion.
90 x 200 = 18000
6 billion times 200 thousand is 1,200,000,000,000,000 (1.2 quadrillion).
2000 billion.
90 is 45 percent of 200 because 200 times 0.45 = 90.
100 billion times 200 billion equals 20,000,000,000,000,000,000, or 20 quintillion. You can also express this as 2 x 10^19 in scientific notation.
90 billion trillion.
2*1022 or 20 sextillion
1 billion
It is: 180/200 times 100 = 90%