Question

1. What is the product of (5.1x10^3)x(3.2x10^3)
A. 16.32 x 10^6
B. 1.632 x 10^7
C. 16.32 x 10^9
D. 1.632 x 10^10
2. What is the product of (7.28x10^-2)(9.1x10^-2)
A. 6.6248 x 10^-3
B. 66.248 x 10^-4
C. 6.6248 x 10^4
D. 66.248 x 10^-3
3. What is the quotient of (2.965x10^7) / (5x10^3
A. 14.825 x 10^4
B. 5.93 x 10^5
C. 14.825 x 10^5
D. 5.93 x 10^3
4. In a recent year, the world production of wheat was about 5.2 x 10^8 metric tons. Canada produced 1/25 of this wheat. About how much wheat did Canada produce?
A. 20.8 x 10^8
B. 2.08 x 10^7
C. 2.08 x 10^6
D. 20.8 x 10^7

My answers are..
1.A or B
2.C
3.A
4.?

Answer 1

#1 A and B are correct values, but only B is in scientific notation
#2 oops. 10^-2 * 10^-2 = 10^(-2 + -2) = 10^-4
add the powers, do not multiply them
#3 (2.965x10^7) / (5x10^3) = (2.965/5)x10^4 = 0.593x10^4 = 5.93x10^3
#4 1/25 * 5.2x10^8 = (5.2/25)x10^8 = 0.208x10^8 = 2.08x10^7

Answer 2

ooga booga