About Me
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
Addition and Subtraction for Grade 2

Addition and Subtraction for Grade 2

Key Concepts

1. Addition

Addition is the process of combining two or more numbers to find their total. The result of addition is called the sum. For example, when you add 3 and 4, you get 7.

2. Subtraction

Subtraction is the process of taking away one number from another to find the difference. The result of subtraction is called the difference. For example, when you subtract 4 from 7, you get 3.

Detailed Explanation

Understanding Addition

When you add two numbers, you are essentially counting up from one number to the next. For example, if you have 3 apples and you get 4 more apples, you now have 7 apples. This can be written as 3 + 4 = 7.

Understanding Subtraction

When you subtract one number from another, you are counting down from the first number. For example, if you have 7 apples and you eat 4 apples, you now have 3 apples left. This can be written as 7 - 4 = 3.

Examples

Example 1: Addition

If you have 2 candies and your friend gives you 5 more candies, how many candies do you have in total?

2 + 5 = 7

So, you have 7 candies.

Example 2: Subtraction

If you have 9 stickers and you give 3 stickers to your friend, how many stickers do you have left?

9 - 3 = 6

So, you have 6 stickers left.

Analogies

Analogy 1: Adding Marbles

Think of adding marbles as putting them all together in a bag. If you start with 4 marbles and add 3 more, you have 7 marbles in total. This is like adding 4 + 3 = 7.

Analogy 2: Removing Toys

Imagine you have a box of 10 toys and you take out 2 toys to play with. You now have 8 toys left in the box. This is like subtracting 2 from 10, which gives you 10 - 2 = 8.

© 2024 Ahmed Baheeg Khorshid. All rights reserved.