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 $8$.
Answer for screen readers
The final 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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