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Lessons with videos, examples, solutions and stories to help students learn the Divisibility Rules. The multiple of a number is always divisible by the number. The word “divisible” means that it can be divided exactly. Example:144 ÷ 4 = 36 (remainder = 0). So, 144 is divisible by 4 and is a multiple of 4.…

In these lessons, we will look at some examples of the long division of whole numbers. In division, the number called the dividend is divided by the divisor, and the result is called quotient. The following diagrams show the parts of a division: dividend, divisor, quotient, remainder. Scroll down the page for more examples and solutions long division. Division…

In these lessons, we will look at some examples of the multiplication of whole numbers. For more practice in multiplication, you could go to our Interactive Math Zone where you can learn the multiplication tables and generate multiplication worksheets according to your needs and get them marked online. The first number in the multiplication is called the…

In this lesson, we will look at some examples of the subtraction of whole numbers. For more practice in subtraction (with or without borrowing), you could go to our Interactive Math Zone where you can generate worksheets according to your needs and get them marked online.The following diagrams show examples of multi-digit subtraction. Scroll down the page…

In this lesson, we will look at some examples of the addition of whole numbers. For more practice in addition (with or without carry), you could go to our Interactive Math Zone where you can generate worksheets according to your needs and get them marked online. Example : 75 + 68 = 143 The result of addition is…

In these lessons, we learn how to compare numbers, whether a number is greater than or less than another number. Sometimes, we may be asked to compare numbers. We may need to determine whether a particular number is greater than or less than another number. For more practice comparing numbers using the symbols (<, >,…

In these lessons, we will learn to compare numbers and put them in order. How to Compare Two Numbers? When we compare two numbers, there are three possibilities: The following diagram shows how to compare numbers. Scroll down the page for examples and solutions on how to compare and order numbers.  Example:Which number is smaller,…

In these lessons, we will learn how to write whole numbers in expanded notation and how to write decimals in expanded notation. The following examples show how to write the Expanded Notation for whole numbers and for decimals. Scroll down the page for examples and solutions. Whole Numbers In Expanded Notation The digits in the…

Each digit in a whole number has a place value, based on its position from the right, as seen in the following place value chart. Scroll down the page for more examples and solutions. The value of a digit in the number is the digit multiplied by the place value. The following table shows examples to distinguish between…

Summary: in this tutorial, you’ll learn about disjoint sets and how to use the Python isdisjoint() method to check if two sets are disjoint. Introduction to Python disjoint sets Two sets are disjoint when they have no elements in common. In other words, two disjoint sets are sets whose intersection is an empty set. For example, the {1,3,5} and {2,4,6} sets are disjoint because they…