Calculate the Sum: Finding 7 + 8 + 12

Q: Why can I add numbers in any order I want?

Addition has the commutative property, which means $ a + b = b + a $. You can rearrange and group numbers to make calculations easier!

Q: What's the best way to add three numbers?

Look for friendly pairs that add up to nice round numbers. In this problem, $ 8 + 12 = 20 $ is easier than $ 7 + 8 = 15 $.

Q: Should I always add from left to right?

Not necessarily! You can add in whatever order makes the math easier. The key is to be systematic and double-check your work.

Q: What if I get a different answer when I check?

If your answers don't match, slow down and try again. Write each step clearly and double-check your mental math. It's better to be careful than fast!

Addition with Three-Number Sequences

$7+8+12=$

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Step-by-step video solution

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00:00 Solve

00:03 Let's use the substitution rule and solve this expression first

00:07 Let's continue solving as usual

00:11 And this is the solution to the question

Step-by-step written solution

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Understand the problem

$7+8+12=$

Step-by-step solution

According to the rules of the order of operations, you can use the substitution property and start the exercise from right to left to calculate comfortably:

$8+12=20$

Now we obtain the exercise:

$7+20=27$

Final Answer

Key Points to Remember

Essential concepts to master this topic

Rule: Addition is commutative, so order doesn't affect the sum
Technique: Group convenient pairs first: 8 + 12 = 20, then 7 + 20 = 27
Check: Verify by adding left to right: 7 + 8 = 15, then 15 + 12 = 27 ✓

Common Mistakes

Avoid these frequent errors

Rushing through calculations without checking work
Don't just add numbers quickly without double-checking = careless errors like getting 11 or 35! Mental math mistakes happen easily with multiple numbers. Always verify your sum using a different order or method.

Practice Quiz

Test your knowledge with interactive questions

$$ 94+12+6= $$

FAQ

Everything you need to know about this question

Why can I add numbers in any order I want?

Addition has the commutative property, which means $a + b = b + a$ . You can rearrange and group numbers to make calculations easier!

What's the best way to add three numbers?

Look for friendly pairs that add up to nice round numbers. In this problem, $8 + 12 = 20$ is easier than $7 + 8 = 15$ .

Should I always add from left to right?

Not necessarily! You can add in whatever order makes the math easier. The key is to be systematic and double-check your work.

How can I avoid making addition mistakes?

Try these strategies:

Add the numbers twice using different orders
Estimate first (7 + 8 + 12 should be close to 30)
Check that your answer makes sense

What if I get a different answer when I check?

If your answers don't match, slow down and try again. Write each step clearly and double-check your mental math. It's better to be careful than fast!

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