Naomi's fish is is 40 millimeters long . her guinea pig is 25 cm long.How much longer is her guinea pig than her fish?

Feb 20, 2018

$\text{21 cm}$

Explanation:

Her guinea pig is $\text{25 cm}$ long.

$\text{25 cm = 250 mm}$

Her fish is $\text{40 mm}$ long, so her guinea pig is longer than her fish by

$\text{25 cm" - "40 mm" = "250 mm" - "40 mm" = "210 mm" = "21 cm}$

Feb 20, 2018

See a solution process below:

Explanation:

First, lets convert the length of Naomi's guinea pig from cm to mm.

$1 \text{cm" = 10"mm}$

We can multiply each side of the equation by $\textcolor{red}{25}$ to obtain the length of the guinea pig in mm.

$\textcolor{red}{25} \times 1 \text{cm" = color(red)(25) xx 10"mm}$

$25 \text{cm" = 250"mm}$

Because we have a length of the guinea pig and the fish in a common metric we can subtract the two values:

$250 \text{mm" - 40"mm" = 210"mm}$

The guinea pig is 210 millimeters longer than the fish.

Or, if we want to convert this to centimeters we can divide by 10:

(210" millimeters")/10 = 21" centimeters"