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Addition and Subtraction Quiz - CBSE Class 7 Mathematics

Free practice quiz: Addition and Subtraction (CBSE Class 7 Mathematics). 17 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 7 Mathematics practice quiz has 17 multiple-choice questions on Addition and Subtraction, and 17 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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Adding Integers with Same Sign

When both integers have the same sign, add their absolute values.
Keep the common sign. Two positives give a positive. Two negatives give a negative.

Both positive

\[(+a) + (+b) = +(a + b)\]

Both negative

\[(-a) + (-b) = -(a + b)\]

Common mistake: Thinking two negatives added give a positive. That rule is for multiplication. A sum of negatives is always negative.

Adding Integers with Different Signs

Subtract the smaller absolute value from the larger absolute value.
The answer takes the sign of the integer with the larger absolute value.
An integer plus its additive inverse always gives zero.

Different signs, |a| > |b|

\[a + b = \text{sign of } a \times (|a| - |b|)\]

Additive inverse

\[a + (-a) = 0\]

Common mistake: Adding the absolute values instead of subtracting them, or giving the answer the sign of the smaller absolute value.

Subtraction Means Adding the Opposite

To subtract an integer, add its additive inverse (opposite).
Change the minus to plus and flip the sign of the second number. Then add.

Subtracting a positive

\[a - b = a + (-b)\]

Subtracting a negative

\[a - (-b) = a + b\]

Smaller minus larger

\[\text{If } b > a > 0, \; a - b = -(b - a)\]

Common mistake: Forgetting that subtracting a negative number is the same as adding a positive number.

Finding Unknowns and Substituting Values

To find x, undo the addition by adding the opposite to both sides.
To evaluate an expression, replace the letter by its value, keeping the sign in brackets.

Solving for x

\[x + (-b) = c \Rightarrow x = c + b\]

Substitution

\[\text{If } a = -n, \; a - m = -n - m = -(n + m)\]

Common mistake: Dropping the negative sign of the given value when substituting, which turns a negative number into a positive one.

Exam tips

Draw a number line: move right when adding positives and left when adding negatives.
Before adding, compare absolute values to decide the sign of the answer.
Check answers by reversing: if a - b = c, then c + b should equal a.

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

Sample questions

What is 5 + 3?
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Answer: B. 8
To find the sum of 5 and 3, simply add them together. 5 + 3 equals 8.
Calculate 15 + (-7).
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Answer: B. 8
Adding a negative number to a positive number means subtracting. So, 15 - 7 equals 8.
Solve: -12 - (-5).
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Answer: A. -7
When subtracting a negative number, it’s like adding. Therefore, -12 + 5 results in -7.
What is -2 - 9?
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Answer: A. -11
Subtracting a positive value from a negative value results in a more negative value. Thus, -2 - 9 = -11.
What is the result of -16 - (-4)?
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Answer: A. -12
Subtracting a negative is like adding: -16 + 4 = -12.

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