Activity
Math Learning Center

Grade 5 Supplement Set A2 – Number and Operations: Primes, Composites and Common Factors

For Teachers 5th Standards
Incorporate riddles into your math lesson by having students make tree factors and determine if the number is a prime or composite. They will also use other clues to find the answer to the riddle while sharpening their...
Lesson Plan
Illustrative Mathematics

How Many Leaves on a Tree?

For Teachers 9th - 12th Standards
This is great go-to activity for those spring or fall days when the weather beckons your geometry class outside. Learners start with a small tree, devising strategies to accurately estimate the leaf count. They must then tackle the...
Lesson Plan
US Environmental Protection Agency

Tree Rings: Living Records of Climate

For Teachers 5th - 10th
Open with a discussion on weather and climate and then explain how tree rings can provide scientists with information about the earth's past climate. Pupils analyze graphics of simulated tree rings from various US locations for the...
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PBS

Human Tree: Ratios

For Students 6th - 7th Standards
Create a personal tree. By visiting an exhibit at the National Museum of Mathematics, the resource introduces the idea of fractals. The exhibit takes an image of the person and creates a tree by repeating scaled images on the shoulders...
Lesson Plan
Science Matters

Plot Study

For Teachers 3rd - 5th
Small groups investigate plots of land to discover how abiotic and biotic factors interact. After recording their findings, scholars share observations with peers and self-reflect on the learning process. 
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Teach Engineering

Computer Simulation of the Sonoran Desert Community

For Students 9th - 12th
See how changes in initial populations and parameters affect a biological community. Individuals use a special software program to simulate a desert community with five species. They adjust initial populations to see how the community...
Activity
Parenting Exchange

Snow Activities Let Children Explore the Wonders of Weather

For Teachers Pre-K - 6th
Just because there's snow on the ground, it doesn't mean you can't go out and play. Take full advantage of the wonderful winter weather with this collection of fun snow day activities.
Activity
Shodor Education Foundation

Shodor Interactivate: Factorize

For Students 3rd - 8th Standards
This Shodor site gives a brief explanation of factorization, and it allows you "to find all of the factorizations of a given number and then draw the product as the area of a rectangle on a grid."
Activity
National Council of Teachers of Mathematics

The Math Forum: Finding the Greatest Common Factor of Two Numbers

For Students 9th - 10th
Math Forum response to question about finding the greatest common factor by using the factoring tree method.
Activity
Amby Duncan-Carr

Prime Factorization: Amby's Resources

For Students 6th - 8th
What is prime factorization? This site goes through a step-by step process explaining different ways to find the prime factorization.
Activity
Elias Saab

Math Drills: Prime Factorization Quiz

For Students 3rd - 8th Standards
This site is an interactive quiz which provides students with a prime factorization problem. Students input their solution and have the program evaluate it. Hints are available if the student needs them, and explanations are provided...

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