How can I solve 23.5 million Nona meters to millimeters using no calculator because I have to show my work

its so simple. u must mind some formulas.

Explanation:

mili->10^ (-3)

micro->10^ (-6)

nano->10^ (-9)

so write the exact number and move "." to left or right depend question.

in this one:

23.5 is 23500000.0 nano with a default dot at the end

for turning to mili u must move the dot 6 steps to left so it will be: 23.5 milimeter.