## Open Educational Resources

Displaying 1 of 5 results
Rating | Views Title Posted Date Contributor Common Core Standards Grade Levels Resource Type

#### AN algorithm for subtraction

A 2nd grade student shared an algorithm for subtraction that was learned at home. This provides a great opportunity to make sense of mathematics! With a focus on place value, the algorithm can be made sense of by our students.  The PDF Pencast simply explains the algorithm...share it in class and use it as a context to make sense of math, develop number sense, focus on place value. NOTE: Adobe Reader DC (or equivalent) is needed to view the "video" aspect of this pencast PDF.

2.NBT.A.1 2.NBT.A.1a 2.NBT.A.1b 2.NBT.A.4 2.NBT.B.5 2.NBT.B.7 2.NBT.B.9 MP.1 MP.2 MP.3 MP.6 MP.7 1 2 3 Video

#### Number Systems - Binary, Decimal, and Other systems

Students can struggle mightily with understanding place value as they begin to add and subtract numbers and "carry" and "borrrow". This short activity can be a great way to help students understand the concept of place value.

2/4/2015 Trey Cox
5.NBT.A.1 5.NBT.A.3 5.NBT.A.3a 5.NBT.A.3b 5.NBT.A.4 4.NBT.A.1 4.NBT.A.2 4.NBT.A.3 4.NBT.B.4 MP.2 MP.7 MP.8 4 5 Activity

#### Piggy Bank Ca\$h!

Meredith has LOTS of one dollar bills in her piggy bank, and she discovers something special when she stacks the bills in piles of 5, 6, and 8 bills. Find a pattern to answer some questions about what will happen if she stacks the bills in piles of 9.

10/28/2014 Lynda Boepple
AZ.4.OA.A.3.1.a 4.OA.C.5 4.NBT.B.6 5.NBT.B.6 6.NS.B.2 MP.1 MP.2 MP.3 MP.4 MP.6 MP.7 MP.8 4 5 6 Activity

#### Number Systems - Place Value

Exploring different number bases may not only help you if you are needing in some particular application (like computers or electronics), but also in helping you make sense of the number system with which you are most familiar â€“ the base 10 number system.

9/6/2014 Trey Cox
5.NBT.A.1 5.NBT.A.2 5.NBT.A.3 5.NBT.A.4 3.NBT.A.1 3.NBT.A.2 4.NBT.A.1 4.NBT.A.2 4.NBT.A.3 MP.1 MP.2 MP.3 MP.4 MP.5 MP.6 3 4 5 6 7 8 Activity

#### Powers of Ten - Number Sense

Students (and adults) have a difficult time trying to grasp very large (and very small) numbers. This activity uses an interesting context (astronomical objects0 to stimulate their interest in modeling enormous distances in a way that can help them understand relative distances. Students naturally arrive at the need for a different kind of number scale than linear and arrive at a "power of ten" (logarithmic) scale. The lesson includes an extension for advanced students ready to begin to investigate logarithms.

9/5/2014 Trey Cox
5.NBT.A.2 6.EE.A.1 8.EE.A.1 8.EE.A.3 HSF-BF.B.5 MP.1 MP.2 MP.3 MP.4 MP.5 MP.6 MP.7 MP.8 5 6 7 8 HS Activity