1.NBT.C.5 Teacher Editions
CCSS.MATH.CONTENT.1.NBT.C.5
:"Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used."
These teacher editions can help students practice this Common Core State Standards skill.
Teacher Editions
Building Math Fluency, Grade 1: Subtraction
Workbook
Building Math Fluency, Grade 1: Subtraction
Give your first graders the power to subtract with confidence, one smart strategy at a time with this teacher edition workbook by Evan-Moor!
Workbook
Building Math Fluency, Grade 1: Addition
Workbook
Building Math Fluency, Grade 1: Addition
Supercharge your first grader's addition skills with strategies that really stick, with this teacher edition workbook by Evan-Moor!
Workbook
