درک ریاضی چهارم ابتدایی با انیمیشن‌های ساده

Welcome to our lesson on basic number concepts! Today we'll explore four-digit numbers and how they work.Let's start by understanding place values in a four-digit number.Let's use the number 3,456 as our example.In this number, 3 is in the thousands place, 4 is in the hundreds place, 5 is in the tens place, and 6 is in the ones place.We can write this number in expanded form, showing the value of each digit.Now, let's learn how to compare four-digit numbers.When comparing numbers, we start from the leftmost digit and work our way right. Let's compare 3,459 and 3,456.Since both numbers have the same thousands and hundreds digits, we look at the tens digit. 5 equals 5, so we move to the ones digit. 9 is greater than 6, so 3,459 is greater than 3,456.Let's practice adding four-digit numbers. We'll add 3,456 and 2,314.Now let's try subtracting. We'll subtract 1,234 from 3,456.Now you're ready to work with four-digit numbers!Let's start with a simple example using pizza to understand fractions.One quarter of a pizza can also be written as zero point two five in decimal form.Now let's learn how to add fractions. Here we have one third plus one sixth.When we add these fractions, we get three sixths.In everyday life, we often use decimals when dealing with money.Here are some common fraction to decimal conversions that are useful to remember.Let's explore geometric shapes and their properties.Each shape has unique properties that define its perimeter and area.The perimeter is the distance around a shape. For a square, we add all four equal sides.Area is the space inside a shape. For a square, we can count the grid squares.Angles are measured in degrees. Common angles include 45, 90, and 120 degrees.Symmetry means a shape can be divided into identical halves.These geometric concepts help us understand shapes and measurements in the world around us.