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Elementary: Factors, Prime Numbers
Students in grades 35 study classes of numbers and investigate their
properties, learning that different kinds of numbers have particular
characteristics  for example, that prime numbers have only two factors,
and that square numbers have an odd number of factors. As they do
multiplication problems, students learn factors and what their product
represents  how, in area models, a product is related to its factors.
Problems appropriate for elementary students in which factors,
factoring, or prime numbers play an important part are listed below.
These problems address the
NCTM
Number and Operations Standard for Grades 35 expectation that
students should understand numbers, ways of representing numbers,
relationships among numbers, and number systems, and should be able
to describe classes of numbers according to characteristics such as
the nature of their factors.
To find relevant sites on the Web, browse and search
Prime Numbers in our
Internet Mathematics Library; to find elementary sites, go
to the bottom of the page, set the searcher for late elementary level
(35), and press the Search button. See also
About Numbers in
the Dr. Math archives.
Access to these problems requires a Membership.

Anderson's Pumpkin Patch
 Teaching the Young Learner Group and Lisa Lavelle

Math Fundamentals, difficulty level 2. How many students are there in Ms. Juncos's fourth grade class?
... more>>

Birds in Trees
 Steve Maurer

Elementary, difficulty level 3. Can you figure out the number of trees in the courtyard?
... more>>

Birthday Beach Bash
 Lisa Lavelle

Math Fundamentals, difficulty level 3. Help determine how many balloons were needed for party favors at the end of this celebration.
... more>>

Calculator Double Vision
 Lisa Lavelle

Elementary, difficulty level 2. Enter a 3digit number twice on a calculator and use division to get the original number.
... more>>

The Chocolate Allergy Revelation
 Antiquity (Steve Earth)

Math Fundamentals, difficulty level 5. Use metareasoning to deduce the ages of three people based on a product, a sum, and a seemingly irrelevant third piece of information.
... more>>

Five Digits of Fun
 Lisa Lavelle

Math Fundamentals, difficulty level 4. Find a fivedigit number based on these clues.
... more>>

It's an open and shut case! Or is it?
 Lisa Lavelle

Elementary, difficulty level 3. A Razzle Dazzle Elementary School locker problem.
... more>>

Jellybean Fractions
 Lisa Lavelle

Elementary, difficulty level 2. Determine good and bad choices in playing the Jellybean Fractions Game.
... more>>

Jellybean Rectangles
 Lisa Lavelle

Math Fundamentals, difficulty level 3. Have fun figuring out strategy in the Jellybean Rectangle game.
... more>>

Peanut Butter and Jelly
 Lisa Lavelle

Math Fundamentals, difficulty level 3. How many sandwiches can we make before using up a package of bread and jars of jelly and peanut butter at the same time?
... more>>

Puzzling Puzzle Pieces
 Lisa Lavelle

Math Fundamentals, difficulty level 2. Explore the ways 108 puzzle pieces can be arranged.
... more>>

Rabbit's Run
 Lisa Lavelle

Math Fundamentals, difficulty level 1. Help Regina develop options for building her rabbit's run.
... more>>

Summer Shoe Leftovers
 Teaching the Young Learner Group

Math Fundamentals, difficulty level 4. Determine which of the leftover shoes might satisfy three shoppers' needs.
... more>>

A Very Special Number
 Lisa Lavelle

Elementary, difficulty level 2. Find a number with some interesting divisibility properties  can you put them all together?
... more>>
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