Elementary School Level Questions: Ask Dr. Math

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Below are some questions and answers from our archive of questions sent via e-mail by K12 students and teachers to Ask Dr. Math. You may also browse the entire elementary level archive by category.

 Units of Measure

Converting Fahrenheit to Celsius
I was wondering if you could tell me how to convert Fahrenheit to Celsius.
Converting Units
I wonder if there is a way of doing math without converting?
Converting Meters to Feet
How many feet are there in one meter? How many feet and inches is 1.84m?
Grams, Milliliters, Centimeters, Meters...
Would you measure an egg in g or ml? How many cm are in a m? If it is 35 degrees C, what season is it? ...
Inches and Feet in Decimal Form
How do I convert fractions of inches and feet into a decimal expression of the length in feet?
Information on the Metric System
Do you have suggestions for places I can find information on the metric system?
Linear Foot
How much is a linear foot?
Metric Conversion
How many meters is 67 centimeters equal to?
Unit Conversions
How many feet are contained in an acre?

 Circles and Measurement

What is the circumference of a circle with a radius of 5.5?
Circumference and Diameter
If you know the circumference of a circle, how do you find the diameter?
Eratosthenes and the Circumference of the Earth
How did Eratosthenes measure the circumference of the earth?
Why is a Circle 360 Degrees?
What is the origin/basis of the degree measurement? Why is a circle divided into 360 degrees rather than some other number?

 Triangles and Angles

Area: Triangle vs. Rectangle
Why do you have to use a different formula to get the area of a triangle than a rectangle or square?
Isosceles Triangle - Angles
Given that one base angle of an isosceles triangle is 39 degrees, find the measure of the other two angles in the triangle.
Teaching Area of Triangles
When I gave a Unit Assessment, all but one student got area of a triangle wrong. Where did I fail?
Triangles with Specific Lengths and Angles
My base is 32 inches and my angle can not exceed 35 degrees. How long will my sides be and what is the inside angle?
Using a Protractor
How do I measure angles using a protractor?

 Problem Situations Involving Measurement

Area of a Room
How many square yards of carpet does it take to fill a room that is 20 yards by 30 yards?
Measuring Four Cups of Flour
A cook is making a cake that requires four cups of flour. She only has two measures, which hold 7 cups and 10 cups. How can she use her measures to measure exactly 4 cups?
Painting Lines for Football
How many cans of paint does it take to stripe a football field?
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Mara Landers

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