Write a number in which the digit 3 is worth 10 times as much as it is in 302

3020

Step-by-step explanation:

To make the number 302, 10 times bigger you will have to multiply the number by 10, in this case the numbers to multiply are the next:

302*10= 3020.

In the number 3020 the digit 3 is 10 times bigger than in the number 302, so by logic we can conclude that the number 3020 is the correct answer.

21

step-by-step explanation:

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.