A scale.
what scale
The units grams would be a good choice.
No, millilitres is a measure of volume not mass. You would use milligrams.
If you have to measure the pencil to a couple decimal places i would suggest a micrometer and a dial caliper.
in tons.
The density of a substance is the ratio of its mass to its volume. So, I would measure the mass and volume of a substance to calculate density.
you would use gallons
The units grams would be a good choice.
a ruler
You would measure it in centimeters.
yes
You would use a scale. You are NOT smarter than a 5th grader!
I would go with inches but you could measure it in centimeters.
A ruler would do the trick.
grams (for their mass), centimetres (for length), millimetres (for thickness/height), possibly Mohs scale for hardness.
to be honest I would use a metre ruler that really helps a lot place your metre ruler on your desk. put your pencil starting from 0. Then measure it. This is how you would measure it.
No, millilitres is a measure of volume not mass. You would use milligrams.
You Use Atomic Mass Number