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Math for Grade 2
1 Number Sense and Numeration
1-1 Counting
1-1 1 Count forward from any given number up to 100
1-1 2 Count backward from any given number within 100
1-2 Place Value
1-2 1 Understand the concept of tens and ones
1-2 2 Identify the place value of digits in two-digit numbers
1-3 Comparing Numbers
1-3 1 Compare two-digit numbers using symbols (<, >, =)
1-3 2 Order numbers from least to greatest and greatest to least
1-4 Rounding
1-4 1 Round numbers to the nearest ten
2 Addition and Subtraction
2-1 Basic Addition
2-1 1 Add two one-digit numbers
2-1 2 Add a one-digit number to a two-digit number
2-2 Basic Subtraction
2-2 1 Subtract two one-digit numbers
2-2 2 Subtract a one-digit number from a two-digit number
2-3 Addition and Subtraction Facts
2-3 1 Memorize addition facts for sums up to 20
2-3 2 Memorize subtraction facts for differences up to 20
2-4 Word Problems
2-4 1 Solve addition word problems with two-digit numbers
2-4 2 Solve subtraction word problems with two-digit numbers
3 Measurement and Data
3-1 Length
3-1 1 Compare the lengths of objects using non-standard units
3-1 2 Measure the lengths of objects using standard units (centimeters and meters)
3-2 Time
3-2 1 Tell time to the nearest hour and half-hour
3-2 2 Understand the concept of A M and P M
3-3 Data Collection
3-3 1 Collect and organize data in a simple bar graph
3-3 2 Interpret data from a simple bar graph
4 Geometry
4-1 Shapes
4-1 1 Identify and name basic 2D shapes (circle, square, triangle, rectangle)
4-1 2 Identify and name basic 3D shapes (cube, sphere, cone, cylinder)
4-2 Spatial Relationships
4-2 1 Understand and use positional words (above, below, beside, between, etc )
4-2 2 Understand and use directional words (left, right, forward, backward)
5 Patterns and Algebra
5-1 Patterns
5-1 1 Identify and extend simple patterns (AB, ABB, etc )
5-1 2 Create and describe patterns using shapes, colors, and numbers
5-2 Algebraic Thinking
5-2 1 Understand the concept of equality (e g , 3 + 2 = 5)
5-2 2 Use variables to represent unknown numbers in simple equations
Memorize Addition Facts for Sums Up to 20

Memorize Addition Facts for Sums Up to 20

Memorizing addition facts for sums up to 20 is a crucial skill that helps in quick mental calculations and builds a strong foundation for more complex arithmetic operations.

Key Concepts

1. Addition Facts

Addition facts are basic equations that show the sum of two numbers. For example, 7 + 8 = 15 is an addition fact.

2. Sums Up to 20

Sums up to 20 involve adding two numbers whose total does not exceed 20. For example, 9 + 6 = 15 is a sum up to 20.

3. Memorization Techniques

Memorization techniques include repetition, flashcards, and using patterns to remember sums. For example, knowing that 10 + any number from 1 to 10 is easy to remember because it is just the number added to 10.

Detailed Explanation

Example 1: Memorizing 9 + 7

To memorize 9 + 7, you can think of it as 9 + 1 + 6. Since 9 + 1 = 10, you can easily add 6 more to get 16. Therefore, 9 + 7 = 16.

Example 2: Memorizing 8 + 6

To memorize 8 + 6, you can think of it as 8 + 2 + 4. Since 8 + 2 = 10, you can easily add 4 more to get 14. Therefore, 8 + 6 = 14.

Analogies to Make It Clearer

Analogy 1: Like Counting Steps

Think of addition as counting steps. If you take 9 steps and then 7 more steps, you have taken a total of 16 steps. This is similar to adding 9 + 7 = 16.

Analogy 2: Like Combining Groups

Imagine you have 8 apples and you add 6 more apples. You now have 14 apples. This is similar to adding 8 + 6 = 14.

By mastering the addition facts for sums up to 20, you will be able to perform quick mental calculations and solve problems more efficiently.

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