Online Educational Resource
OER Title:
Addition and Subtraction of Rational Numbers
OER URL Location:
http://education.ti.com/en/timathnspired/us/detail?id=92B7577EE84B47629C00EF1DE2440BE0&t=6
6B8D081F0AA4F0DAD494AACD6C77BC4
Core Standards addressed:
Students will apply and extend previous understandings of addition and subtraction to addition and
subtraction of rational numbers; represent addition and subtraction on a horizontal or vertical
number line (CCSS).
Practice Standards Addressed:
Students will model with mathematics (CCSS Mathematical Practice).
Students will use appropriate tools strategically (CCSS Mathematical Practice).
Grade Level:
7
Instructional Block___2___ Part ___A__
Description of OER Resource:
This lesson involves representing addition and subtraction of signed mixed numbers on a number line
for a randomly generated target sum or difference. As a result, students will:
 Represent addition and subtraction of signed mixed numbers on a number line.
 Calculate sums and differences, and use the TI-Nspire to check the accuracy of their
calculations.