Addition and Subtraction Within 100

Addition and Subtraction Within 100

Course overview

This course teaches Grade 2 students how to add and subtract within 100 using place value, tens and ones, and clear story reasoning. Students will see how a number can be built, taken apart, and explained with words, drawings, and equations.

What students will learn

• Add two-digit numbers without regrouping.
• Use make-ten thinking to make addition easier.
• Subtract two-digit numbers without regrouping.
• Read story language and decide whether to add or subtract.
• Write an equation that matches a word problem.

Lessons

• Add Two-Digit Numbers Without Regrouping - Learn to add tens to tens and ones to ones with place value.
• Subtract Two-Digit Numbers Without Regrouping - Learn to subtract two-digit numbers without losing track of place value.
• Solve Word Problems Within 100 - Learn to choose the operation that fits the story.

Parent guide

Work through the course in short sessions. Encourage the child to name the tens and ones in each number before solving. If a problem is written as a story, ask what changed, what stayed the same, and what is being asked.

Completion

A student finishes this course when they can add and subtract within 100, explain their strategy with place value language, and solve a short word problem with an equation and a clear answer.