Stage 2

### Objectives

• Represent addition and subtraction with models and expressions
• Add and subtract within 20
• Understand and apply special properties of addition and subtraction
• Comprehend word problems to represent them using addition and subtraction expressions
• Comprehend and solve word problems requiring addition and subtract involving two and three numbers
• Understand the concept of equations involving addition and subtraction
• Solve problems involving multiple addition and subtraction expressions or equations
• Understand the relationship between addition and subtraction and apply them to solve problems

##### Unit 2: Addition - word problems

Students learn to comprehend simple word problems and apply addition skills to solve them.

##### Unit 3: Addition - critical thinking

Students learn to solve problems related to addition skills.

Students practice addition problems to improve the their ability to add quickly and accurately.

##### Unit 5: Introduction to subtraction

Students learn about subtraction. Concepts learned in this unit include subtraction with the aid of pictures, horizontal and vertical subtraction, and subtraction expressions and sentences.

##### Unit 6: Subtraction - word problems

Students learn to comprehend simple word problems and apply subtraction skills to solve them.

##### Unit 7: Subtraction - critical thinking

Students learn to solve problems using subtraction skills.

##### Unit 8: Subtraction - mental subtraction

Students practice subtraction problems to improve the their ability to subtract quickly and accurately.

##### Unit 9: Addition and subtraction of single-digit numbers

Students practice addition and subtraction of single-digit numbers.