Arithmetic Expressions
NCERT Class 7 Mathematics Chapter 2: Arithmetic Expressions (Pages 24–45)
Summary of Arithmetic Expressions
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Arithmetic Expressions at a Glance
CBSE
Class 7
Mathematics
Ganita Prakash
2
24–45
7 study resources
Arithmetic Expressions Summary
In this chapter, students will learn about arithmetic expressions, which are mathematical phrases formed by numbers and operations like addition, subtraction, multiplication, and division. Understanding arithmetic expressions is essential as they form the foundation for problem-solving in mathematics. The chapter begins by explaining what an arithmetic expression is, providing examples like thirteen plus two or twenty minus four. Each expression has a value, which is the result of performing the operations involved. For example, when you add thirteen and two, the value is fifteen. Students will also learn the notation used to denote the equality of an expression and its value, using the equality sign. Next, the chapter explores different ways to express the same numerical value using various combinations of two numbers and the four basic operations. This shows students that there are often multiple methods to arrive at the same result. For instance, the number twelve can be expressed as ten plus two, fifteen minus three, three times four, or twenty-four divided by two. This part of the lesson encourages creativity and flexibility in thinking about numbers. Furthermore, the chapter discusses how to compare arithmetic expressions using equality and inequality signs. Students are taught to assess the values of different expressions and determine if one is greater than, less than, or equal to another. For example, they learn that the expression ten plus two is greater than seven plus one because both evaluate to the numerical values of twelve and eight, respectively. The chapter includes engaging activities where students fill in blanks to create equal expressions and arrange several expressions in increasing order of their values. This hands-on practice reinforces their understanding and helps them learn to work with expressions dynamically. To enhance comprehension, real-world scenarios are provided, allowing students to visualize the concept of greater than and less than through relatable situations. For instance, by imagining two characters, Raja and Joy, with different amounts of marbles, students deduce which has more based on arithmetic expressions corresponding to the situation. Overall, this chapter supports students as they develop their skills in handling arithmetic expressions, laying important groundwork for future mathematical learning and reasoning.
