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Addition and Subtraction Quiz - CBSE Class 7 Mathematics

Free practice quiz: Addition and Subtraction (CBSE Class 7 Mathematics). 35 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 7 Mathematics practice quiz has 35 multiple-choice questions on Addition and Subtraction, and 35 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

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Like and Unlike Terms

A term is a product of a number (coefficient) and variables, like ax or by.
Like terms have the same variables raised to the same powers. Only their coefficients may differ.
Unlike terms have different variables or different powers, such as x and y, or x and x squared.

Like terms

\[ax \text{ and } bx\]

Unlike terms

\[ax \text{ and } by\]

Unlike (different powers)

\[ax \text{ and } bx^{2}\]

Common mistake: Thinking x and x squared are like terms just because both use the letter x.

Adding and Subtracting Like Terms

To add or subtract like terms, add or subtract their coefficients only.
The variable part stays exactly the same in the answer.
A term with no written coefficient, like x, has coefficient one.

Adding like terms

\[ax + bx = (a+b)x\]

Subtracting like terms

\[ax - bx = (a-b)x\]

Hidden coefficient

\[x = 1x\]

Common mistake: Changing the variable while combining, like writing x + x as x squared instead of 2x.

Unlike Terms Stay Separate

Unlike terms cannot be combined into a single term. They are left joined by plus or minus.
In a long expression, group the like terms together, then combine each group.

Cannot combine

\[ax + by \text{ stays as } ax + by\]

Group like terms

\[ax + by + cx = (a+c)x + by\]

Common mistake: Joining unlike terms, like writing ax + by as (a+b)xy. Unlike terms must stay separate.

Adding and Subtracting Whole Expressions

To add expressions, remove the brackets and combine like terms.
To subtract an expression, change the sign of every term inside its bracket, then add.

Adding expressions

\[(ax + b) + (cx + d) = (a+c)x + (b+d)\]

Minus before a bracket

\[-(cx + d) = -cx - d\]

Subtracting expressions

\[(ax + b) - (cx + d) = (a-c)x + (b-d)\]

Common mistake: Changing the sign of only the first term inside the bracket when subtracting, instead of every term.

Exam tips

Each sign belongs to the term just after it. Move the sign along with its term when grouping.
When several like terms appear, combine the coefficients from left to right.
Check your answer by putting a small value for the variable into both sides.

Beta: made with AI and checked by a second AI. A teacher has not reviewed it yet.

Sample questions

What is the sum of 5 and 7?
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Answer: C. 12
To find the sum, you add the numbers together: 5 + 7 = 12.
Find the result of 100 - 45.
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Answer: A. 55
Perform the subtraction: 100 - 45 = 55.
What is the sum of 235 and 765?
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Answer: B. 1000
Add the two numbers together: 235 + 765 = 1000.
What is the result of adding 7x + 9x?
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Answer: A. 16x
To add 7x and 9x, combine the coefficients: 7 + 9 = 16, resulting in 16x.
Combine like terms in 2a + 3a - a
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Answer: A. 4a
Add and subtract the coefficients: 2 + 3 - 1 = 4, resulting in 4a.

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