Make a Difference

Symbols make everything so much more concise. Young mathematicians learn to write addition and subtraction expressions — including those involving variables — from verbal phrases. Bar models help them understand the concept. 

After learning about the effects of water pollution, your class will discuss ways to make people in their community aware of the importance of water conservation. Then, your young environmentalists will write a letter to the local...

Subtraction is all about opposites and the fifth lesson in a series of 25 introduces the concept of subtracting integers. Pupils connect subtracting with discarding a card in the integer game. They develop the rule for subtracting...

Middle schoolers are prompted to solve six word problems, involving the addition and subtraction of integers. This instructional activity contains real-world applications, including finding temperature changes. Invite your students to...

Positive and negative numbers are everywhere in the world around us. Whether it's charged particles in atoms, a hot air balloon rising and falling in the sky, or a series of bills and checks being delivered in the mail, this resource...

This dreamy resource has little ones computing the change on the purchase of an ice cream cone. Mia describes each step in two methods: subtraction of decimals and counting up from the sale price.

You may get shocked by static electricity but not by this activity. Extend algebra learners' understanding of the concept, including how to make zero. The video demonstrates the real-life example of electricity by making zero with...

What are the characteristics of a polynomial that would make it factorable by the difference of squares rule? There are four must haves: two terms, coefficients are perfect squares, minus sign, degree of each term is even or zero. If it...

Learners factor polynomials using the sum and difference of cubes. They also learn connections between the graph and expression.

Use word problems to teach systems of equations! The instructor in this video demonstrates how to solve a word problem using a system of equations and the elimination by subtraction method. She goes through each step, carefully...