9 Digits in a 3×3 Matrix

Students explore addition problems with two 3 digit numbers and discover patterns that help find solutions and double check arithmetic answers.

Grades covered: 3 through 8
Curriculum Topics: Addition, Number Patterns, Casting Out Nines


Idea Sheets are cross-referenced to subjects listed in the Common Core, Next Generation Science Standards, and California Content Standards.

Categories include:
  • Grades 3-5
  • Grades 6-8
  • Math
Tags: Problem Solving, Addition & Subtraction
Subjects covered: ["Math"]