# Lesson Plan: Subtracting by Counting Back: Numbers up to 10 Mathematics • 1st Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to subtract within 10 by counting back from the starting number.

#### Objectives

Students will be able to

• understand how counting back and subtracting are related,
• subtracting two numbers within 10 by counting back using number tracks,
• subtracting two numbers within 10 by counting back using models (objects and counters),
• subtracting two numbers within 10 by counting back without models,
• find the missing number in subtraction sentences,
• solve story problems involving subtracting two numbers within 10 by counting back.

#### Prerequisites

Students should already be familiar with

• subtracting numbers up to 5,
• reading and writing subtraction equations.

#### Exclusions

Students will not cover

• subtracting from numbers above 10,
• vertical subtraction,
• subtracting zero or all,
• using number lines.