Metric units of mass review (g and kg)

CCSS Math: 5.MD.A.1
Review the size of grams and kilograms and how to convert between the two.  Then, try some practice problems.

Metric units of mass

Mass is used to measure the weight of an object. For example, you are measuring the mass of your body when you step on to a scale.
In the metric system of measurement, the most common units of mass are the gram and kilogram.

How much is a gram?

A small paperclip has a mass of about $1$ gram:

How much is a kilogram?

A wooden baseball bat has a mass of about $1$ kilogram:

Practice set 1: Estimating mass

Problem 1A
Identify the most reasonable unit to measure the mass of a pack of gum.

Want to try more problems like this? Check out this exercise.

Converting kilograms to grams

$1 \text{ kilogram} = \greenD{1000}\text{ grams}$
To convert kilograms to grams we multiply the number of kilograms by $\greenD{1,000}$.
Example:
$\blueD{8} \text{ kilograms} = \blueD{8}\times \greenD{1000}=\blueD{8}\greenD{000}\text{ grams}$

Converting grams to kilograms

$1\text{ gram}= \dfrac1{\greenD{1000}} \text{ kilogram}$
To convert grams to kilograms we divide the number of grams by $\greenD{1000}$.
Example:
$\pink{9} \text{ g}= \dfrac{\pink{9}}{\greenD{1000}} = \pink{9}\div\greenD{1000}=\blue{0.009}\text{ kg}$
$7$ kilograms $=$