21 minus 13

Understand the Problem

The question is asking for the result of the mathematical operation of subtraction, specifically to calculate what 21 minus 13 equals.

Answer

The answer is $8$.

Steps to Solve

Set up the subtraction operation
Write the subtraction operation based on the problem statement: $$ 21 - 13 $$
Perform the subtraction
Subtract the second number from the first number: $$ 21 - 13 = 8 $$
State the conclusion
The result of the operation is: $$ 8 $$

The final answer is $8$.

More Information

Subtraction is one of the four basic arithmetic operations. It's often used in real-life situations such as handling money, calculating scores, or measuring quantities.

Tips

Mistaking subtraction for addition and getting the wrong answer (e.g., calculating $21 + 13$ instead of $21 - 13$).
Not aligning the numbers properly when performing mental math, which can lead to errors.

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