Class 7 Mathematics — Chapter 2: ARITHMETIC EXPRESSIONS

What you'll learn

• ▸Introduction to Arithmetic Expressions
• ▸Comparing Values of Expressions
• ▸Reasoning-based Expression Comparison
• ▸Using Brackets to Control Evaluation Order
• ▸Identifying Terms in Expressions
• ▸Properties of Addition with Terms

Chapter Summary

--- PAGE 1 --- 2 ARITHMETIC EXPRESSIONS 0774CH02 2.1 Simple Expressions You may have seen mathematical phrases like 13 + 2, 20 – 4, 12 × 5, and 18 ÷ 3. Such phrases are called arithmetic expressions. Every arithmetic expression has a value which is the number it evaluates to. For example, the value of the expression 13 + 2 is 15. This expression can be read as ‘13 plus 2’ or ‘the sum of 13 and 2’. We use the equality sign ‘=’ to denote the relationship between an arithmetic expression and its value. For example: 13 + 2 = 15. ? Example 1: Mallika spends ₹25 every day for lunch at school. Write the expression for the total amount she spends on lunch in a week from Monday to Friday. The expression for the total amount is 5 × 25. 5 × 25 is “5 times 25” or “the product of 5 and 25”. Different expressions can have the same value. Here are multiple ways to express the number 12, using two numbers and any of the four operations +, –, × and ÷: 10 + 2, 15 – 3, 3 × 4, 24 ÷ 2. ? Choose your…

Practice Questions from this Chapter

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1. Simplify complex expressions? Get Solution →
2. Explore different number systems? Get Solution →
3. Why do operation orders matter? Get Solution →
4. What is a mathematical phrase like '13 + 2' or '12 × 5' called? Get Solution →
5. What does the equality sign ‘=’ denote in mathematics? Get Solution →
6. According to the chapter, what is the primary purpose of using brackets in mathematical expressions? Get Solution →
7. What are the parts of an expression that are separated by a '+' sign called? Get Solution →
8. When identifying terms, how is an expression with subtraction, like '83 – 14', handled? Get Solution →

Did you know?

• 💡 Zero is the only number that cannot be represented by Roman numerals.
• 💡 Pi is an irrational number with digits that never repeat or end.
• 💡 The multiplication symbol 'x' was first used in 1631.
• 💡 A googol is the number 1 followed by one hundred zeros.
• 💡 Ancient Babylonians used a base-60 number system for their arithmetic.

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