Question

What is (3.2 × 10^4) × (2 × 10^–2)?

A. 6.4 × 10^–8
B. 6.4 × 10^–2
C. 6.4 × 10^2
D. 6.4 × 10^8

Answer 1

So, what is 10^4?

Answer 2

10,000?

Answer 3

yup, so what's 3.2 * 10,000 ?

Answer 4

32,000?

Answer 5

perfect. so 2 * 10^-2 can be rewritten as

2 / 10^2

Now, what is 10^2 ?

Answer 6

100

Answer 7

yes, so 2 / 100 can be simplified to what?

Answer 8

uhm, I'm sorry I'm brain dead.

Answer 9

2/100 = 1/50
because 2 divides into 1 time, and 2 divides into 100 50 times. make sense?

Answer 10

because 2 divides into 2 1 time, and 2 divides into 100 50 times. make sense?

Answer 11

Yes

Answer 12

ok so you have 32, 000 * 1/50

which is... ?

Answer 13

uh, 32...?

Answer 14

No,
32,000 * 1/50 is another way of saying how many times dies 50 divide into 32,000.

Answer 15

does*

Answer 16

640...?

Answer 17

yup. So, which one of your answer choices = 640?

Answer 18

C

Answer 19

You got it! Nice.

Answer 20

Thank you so much!

Answer 21

You're welcome :)