Question

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?

Answer 1

`"21 cm"`

Explanation:

Her guinea pig is `"25 cm"` long.

`"25 cm = 250 mm"`

Her fish is `"40 mm"` long, so her guinea pig is longer than her fish by

`"25 cm" - "40 mm" = "250 mm" - "40 mm" = "210 mm" = "21 cm"`

Answer 2

See a solution process below:

Explanation:

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

`1"cm" = 10"mm"`

We can multiply each side of the equation by `color(red)(25)` to obtain the length of the guinea pig in mm.

`color(red)(25) xx 1"cm" = color(red)(25) xx 10"mm"`

`25"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"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"`