Curated OER
Number and Number Relations: Lesson 3
Fourth graders explore the concepts of addition and subtraction. They investigate the relationship between addition and subtraction and determine the operation needed to solve a problem.
Illustrative Mathematics
Guess My Number
Make a game out of solving equations. This particular activity works well for pairs of learners. Follow the instructions to have player one pick a number and player two verbally give an equation. Participants need to make sense of a...
Helping with Math
Addition: Number Bonds to 20
Pupils fill in the missing addend to an addition problem that adds up to 20. This number could be a one-digit or two-digit number. They complete a total of  41 missing addend problems. Answers are available.
Curated OER
Rolling Number Sentences
Budding mathematicians investigate how to write number sentences using the Roll-the-Dice tool in "Kid Pix". They correlate the dots on the dice to numbers and then learn to use the addition and equal symbols to write number sentences....
Curated OER
Fish and Zooplankton Through Remote Sensing
Ecology aces examine sea surface temperature maps and relate temperatures to concentration in fish and zooplankton populations. Take your class to a computer lab and provide experience with actual remote sensing data. Some of the links...
Primary Resources
Number Bonds to 20
Kids can add their way to 20 with this cute bug-themed presentation. Each slide contains an addition sentence that adds up to 20 and various insect images for little learners to count. It's a highly visual resource that can be used when...
Rational Number Project
Rational Number Project: Initial Fraction Ideas
Deepen the fractional number sense of young learners with this introductory lesson on equivalent fractions. After completing a short warm-up activity, children go on to work in pairs using fraction circles to complete a table of...
Math Learning Center
Grade 1 Supplement Set A5 – Number and Operations: Place Value
First graders work together to sort, categorize, and order collections of objects through activities that help build number sense.Â
University of Minnesota
Fraction Operations and Initial Decimal Ideas
Add another strategy to the toolboxes of young mathematicians with this elementary math lesson on using number lines to add and subtract fractions.
Curated OER
Getting Started with Math By Hand Concept App
Pupils build number sense skills and gain confidence at math by hand. Review how to perform algorithms for the four basic operations. A step-by-step mode emphasizes place value in the base-ten system for each algorithm. Learners identify...
Curated OER
Number Base Clocks
Young scholars investigate place value in base ten. In this number sense instructional activity, students participate in an online instructional activity at www.shodor.org/interactivate/activities/NumberBaseClocks and demonstrate how to...
Curated OER
Addition Grids
Build number sense and provide a problem-solving strategy for solving three-digit addition problems. The class will create number grids in order to solve triple-digit addition. There are two sample problems to solve.
Noyce Foundation
Perfect Pair
What makes number pairs perfect? The resource provides five problems regarding perfect pairs of numbers, the definition of which changes in complexity with each task. Solutions require pupils to apply number sense and operations, as well...
Curated OER
Get On Board
Students create a ticket table illustrating the cost of tickets by alternative transportation. In this number sense lesson, students write number sentences to compare and contrast difference information in their chart. Students figure...
Curated OER
Krypto Math Game
Students play a math game. In this number sense and mental math lesson, students play a game where they use mental math to form equations that result in the target number required to win the game.
Ohio Department of Education
Fraction Models - Grade Three
Explore fractions using different manipulatives and illustrations. Your class can create a variety of models of fractions and mixed numbers with drawings and manipulatives. They then work to compare fractions, mixed numbers, and whole...
Curated OER
Fractions Lesson: Understanding Mixed Numbers
A developmentally sound approach to teaching learners the difference between fractions, whole numbers, and mixed numbers. They are shown each type of number then run through a series of slides shouting out the name of that number type....
Curated OER
Numbers and Operations
Pupils practice using proportions to discover the fraction needed to use the right amount of an ingredient. They calculate the number of ounces in one gallon as well. They answer questions to complete the lesson.
Curated OER
Add Positive And Negative Numbers
Scholars investigate the concept of adding positive and negative numbers. They practice adding using the number line for scaffolding. This can be done as a game for younger learners, but may also be helpful for engaging the older pupils.
Curated OER
Place Value Review
Review various aspects related to place value with this easy-to-follow presentation. Learners can review the base ten system, see representations, and read descriptions of ones, tens, hundreds, and thousands, and numbers in expanded...
Curated OER
Add It Up In Number Ville! Adding 2-Digit Numbers With and Without Regrouping
Students explore adding 2-digit numbers. In this math lesson, students identify 2-digit numbers and use base ten blocks to practice adding. Students use addition to break a code.
Curated OER
Addition: Number Bonds to 30
In this addition worksheet, students fill in the missing addend to an addition problem that adds up to 30. This number could be a one or two digit number. Students complete 41 missing addend problems.
Curated OER
I, Robot, Can Do That!
Assign groups of middle school oceanographers to research one of the following underwater robots; ABE, Herculues, ROPOS, RCV-150, Tiburon, or general purpose ROVs. An included handout guides them through information to be gathered. Each...
Curated OER
My Wet Robot
After hearing about the 2006 PHAEDRA mission that explored the Aegean Sea, middle schoolers work in groups to create a robotic vehicle. They must consider power, propulsion, and other vital systems. Use the multitude of external...