Question 1 of 14 Mr. Jackson is ordering kazoos for his second, third, and fourth grade music classes. The kazoos come in boxes of 8. There are 26 second graders, 24 third graders, and 30 fourth graders. Which expression represents how many boxes of kazoos Mr. Jackson needs to order so that every student receives a kazoo?

A.
(
26
×
24
×
30
)
+
8
B.
(
26
+
24
+
30
)
×
8
C.
(
26
+
24
+
30
)
÷
8
D.
(
26
×
24
×
30
)
÷
8

It's C. because 26+24+30 equals 80 then you divide 80 by 8 to get 10, so you need 10 boxes.

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.