Grayson wrote 1.47 ÷ 7 = 2.1 in her math journal.
use words, numbers, or pictures to explain why grayson’s thinking is incorrect.

It is incorrect, the right answer is 0.21

Step-by-step explanation:https:

1) If we multiply 1.47 for 100 up and down, we will have the fraction:

100* =

2) Now we can use division of fractions, it is easier when solving a problem like that:

÷ = *

as we know, when dividing fractions you repeat the first and multiply for de inverse of the second

3) * =

4) Simplify. Divide up and down for 7.

=

5) Dividing the fraction you will find 0.21

i'm pretty sure it's 477,585,296, but perhaps my math is incorrect.

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6