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# Addition and subtraction

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### Fact Families - Addition & Subtraction

- Lesson plan -

Students lean about Fact Families by adding and subtracting numbers up to 10 and up to 20.

### Place Value - Digits up to hundreds

- Lesson plan -

Determine the value of a digit to hundreds. Model numbers using Base 10 Blocks.

### Bus Sum - phase 1

- Activity -

Teach students the meaning of adding and subtracting.

### Twin Numbers to 10 or 20

- Activity -

Complete the number twin by choosing the correct missing number.

### One more or one less

- Activity -

Look at the items. Add one (or subtract one) and write down that number.

### Add & Subtract Whole Numbers

- Lesson plan -

Develop and analyze strategies for adding and subtracting numbers.

### Addition & Subtraction

- Lesson plan -

Develop and analyze strategies for adding and subtracting numbers.

### Judging Reasonable Answers

- Lesson plan -

Students will estimate to judge if answers are reasonable in addition, subtraction, division, and multiplication problems.

### Add & Subtract Fractions

- Lesson plan -

Develop fluency with addition and subtraction of non-negative rational numbers with unlike denominators.

### Adding & Subtracting Integers

- Lesson plan -

Add and subtract integers in real-life situations including temperature, bank account balances and sea level.

### Bead Necklace

- Activity -

A clear and simple bead necklace.

### Adding & Subtraction Fractions with Unlike Denominators

- Lesson plan -

Use fraction models to add and subtract fractions with unlike denominators, and progressing to solve addition and subtraction problems without modeling.

### Number Bonds

- Activity -

Students learn how to partition numbers.

### Adding & Subtracting Decimals

- Lesson plan -

Add and subtract decimals, with instruction and practice targeted at correctly organizing numbers to avoid typical computational errors.

### Twin Numbers - Introduction

- Lesson plan -

Practice twin numbers up to 20.

### Estimation

- Lesson plan -

Estimate sums and differences.