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### Place Value Chart: To Ten Thousands

- Activity -

Students learn the value of numbers.

### The Sum Machine

- Activity -

A machine to calculate all kinds of sums.

### Seriation

- Activity -

Students learn to look at images that are in the right order.

### 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.

### Algebraic Expressions

- Activity -

Learn how to translate English phrases into algebraic expressions.

### Numerical Expressions

- Activity -

Students learn how written phrases are interpreted as numeric expressions.

- Lesson plan -

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

### Abacus (vertical)

- Activity -

Learning how to add and subtract.

- Lesson plan -

Add and subtract decimals to solve problems. Solve problems involving money.

### Generate Equivalent Expressions

- Activity -

Apply the properties of operations to generate equivalent expressions by completing the missing information.

### Number Bonds

- Activity -

Students learn how to partition numbers.

### Place Value Chart: To Billions

- Activity -

Students learn the value of numbers. Ones up to a billion.

- Activity -

A clear and simple bead necklace.

- 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.

### Bus Sum - phase 1

- Activity -

Teach students the meaning of adding and subtracting.