A complete unit with lessons and exercises that covers both the metric and the customary systems and is aligned to the Common Core Standards.
These are complete worksheets that include direct instruction for the student AND ample practice problems (including word problems). Great for independent practice/homework.
First, the students learn about units of length. We start by measuring to the nearest quarter of an inch. Since most rulers measure to the eighth or sixteenth part of an inch, it is helpful to cut out a ruler from the lesson that only has tick marks for every fourth of an inch, and tape that onto an existing ruler.
Next, students measure using centimeters and millimeters. They also create line plots from measurement data where the horizontal scale is marked off in quarters of an inch.
The next two lessons help students become familiar with feet, yards, miles, meters, and kilometers-the units for measuring medium and long distances.
Then, it is time to measure weight. The first lesson deals with pounds and ounces, and the next one with grams and kilograms. It is very helpful if you can use a kitchen scale for these lessons.
Lastly, we study liquid volume, first of all the customary units (cup, pint, quart, and gallon) and then the metric units (liter and milliliter). The emphasis is on becoming familiar with the customary units of volume and measuring volume in milliliters.
Many of the lessons in this unit also have an optional section about conversions between measuring units, such as changing three meters into centimeters, or two feet into inches. I have included some easy conversion problems for converting between measuring units, because even though they are not included in the Common Core Standards for third grade, I feel many third graders are ready for them.
We all use various measuring units in our everyday lives, and using them is the key to remembering what they are, how big they are, and what the conversion factors are. Naturally, people in the United States do not use the metric system a lot, while people elsewhere do not use the customary system. The units your students do not use are likely to be forgotten easily. Encourage your students to spend their free play time with measuring tools such as a scale, measuring cups, measuring tapes, and rulers.
You can print the whole unit and make it into a workbook to fully teach these topics. A great replacement option for your math curriculum. The answer key is included!