Tyler and katie started a lemonade stand to raise money. they donated \dfrac{2}{10}
10
2
start fraction, 2, divided by, 10, end fraction of their profits to their school library, \dfrac{1}{10}
10
1
start fraction, 1, divided by, 10, end fraction to the animal shelter, and \dfrac{4}{10}
10
4
start fraction, 4, divided by, 10, end fraction to the food bank. they saved the rest to buy materials for their next project.
what fraction of their profits did tyler and katie donate?

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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.