Class 7 Exam > Class 7 Notes > Mathematics (Ganita Prakash) Class 7 - New NCERT > Very Short Question Answer: Arithmetic Expressions
Class 7 Maths Chapter 2 Very Short Question Answer - Arithmetic Expressions
Q1: Find the values of the following expressions by writing the terms in each case.
(a) 35 - 8 + 9
Ans: Terms: 35, -8, 9.
Expression: 35 + (-8) + 9
= 27 + 9
= 36.
(b) 50 - 3 × 7 + 13
Ans: Terms: 50, -3 × 7, 13.
Expression: 50 + (-21) + 13
= 50 - 21 + 13
= 42.
(c) 60 - 15 + 5 + 10
Ans: Terms: 60, -15, 5, 10.
Expression: 60 + (-15) + 5 + 10
= 45 + 5 + 10
= 60.
Q2: Use ‘>’ or ‘<’ or ‘=’ in each of the following expressions to compare them. Can you do it without complicated calculations? Explain your thinking in each case.
(a) 322 + 215 ____ 324 + 213
Ans: Left side: 322 + 215 = 537
Right side: 324 + 213 = 537
322 + 215 = 324 + 213 (They are equal)
(b) 571 + 432 ____ 570 + 434
Ans: Left side: 571 + 432 = 1003
Right side: 570 + 434 = 1004571 + 432 < 570 + 434
(c) 418 – 234 ____ 414 – 238
Ans: Left side: 418 - 234 = 184
Right side: 414 - 238 = 176
418 - 234 > 414 - 238
Q3: Compare and answer if LHS = RHS .
(a) 4 × (5 + 8) = 4 × 5 + 4 × 8
Ans: This is already correct.
LHS = 4 × (5 + 8) = 4 × 13 = 52
RHS = 4 × 5 + 4 × 8 = 20 + 32 = 52
(b) 6 × (3 + 7) = 6 × 3 + 7
Ans: This is incorrect.
LHS = 6 × (3 + 7) = 6 × 10 = 60
RHS = 6 × 3 + 7 = 18 + 7 = 25
Q4: Fill in the blanks to make the expressions equal on both sides of the = sign:
(a) 15 + 6 = _____ + 8
Ans: 15 + 6 = 21,
so 13 + 8 = 21.
The blank is 13.
(b) 30 + _____ = 5 × 8
Ans: 5 × 8 = 40,
so 30 + 10 = 40.
The blank is 10.
(c) 9 × _____ = 72 ÷ 3
Ans:
72 ÷ 3 = 24,
so 9 × 4 = 24.
The blank is 4.
(d) 50 - _____ = 40
Ans: 50 - 10 = 40.
The blank is 10.
Q5: Compare the following pairs of expressions using '<', '>', or '='
(a) 72 × 34 - 15 ___ 72 × 30 - 15
Ans: LHS = 72 × 34 - 15
Let us first solve 72 x 34 = 72 × (30 + 4)
= 72 × 30 + 72 × 4.
So, 72 × 34 - 15 = 72 × 30 + 72 × 4 - 15, and
RHS = 72 × 30 - 15
So, 72 × 34 - 15 > 72 × 30 - 15
(b) 63 - 9 + 5 ___ 63 - 9 + 5
Ans: Same expression.
So, 63 - 9 + 5 = 63 - 9 + 5.
The document Class 7 Maths Chapter 2 Very Short Question Answer - Arithmetic Expressions is a part of the Class 7 Course Mathematics (Ganita Prakash) Class 7 - New NCERT.
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FAQs on Class 7 Maths Chapter 2 Very Short Question Answer - Arithmetic Expressions
| $1. What are large numbers and how are they used in everyday life? |  |
Ans.Large numbers are numbers that are significantly higher than those we typically encounter in daily activities. They are often used to describe large quantities, such as the population of a country, distances in space, or financial figures. Understanding large numbers helps us comprehend and compare significant data effectively.
| $2. How do we represent large numbers in a simplified way? | |
Ans.Large numbers can be represented in scientific notation or by using prefixes such as kilo (thousand), mega (million), giga (billion), etc. This makes it easier to read and understand them without dealing with long strings of digits.
| $3. Why is it important to learn about large numbers in mathematics? | |
Ans.Learning about large numbers in mathematics is crucial as it enhances our numerical literacy. It allows us to solve real-world problems, make informed decisions, and understand scientific data that often involves large quantities.
| $4. Can you give examples of large numbers found in nature? | |
Ans.Examples of large numbers in nature include the estimated number of stars in the Milky Way galaxy, which is around 100 billion, or the number of cells in the human body, estimated to be around 37 trillion. These figures illustrate the vastness of the universe and biological complexity.
| $5. How do we compare large numbers effectively? | |
Ans.Comparing large numbers can be done using various methods such as using a number line, looking at the place value, or even converting them to scientific notation for easier comparison. Understanding the significance of each digit helps in determining which number is larger or smaller.
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