Addition Problem: Adding 10 Units to 72

Basic Addition with Two-Digit Numbers

Add ten units to the number 72.

What is the resulting number?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Add ten units to the number 72.

What is the resulting number?

2

Step-by-step solution

To find the resulting number when ten units are added to 72, we will perform the following steps:

  • Step 1: Identify the starting number, which is 72.
  • Step 2: Add 10 to the starting number. This is done by calculating 72+10 72 + 10 .

Let's perform the calculation:

72+10=82 72 + 10 = 82

Therefore, the resulting number when ten units are added to 72 is 82 82 .

3

Final Answer

82 82

Key Points to Remember

Essential concepts to master this topic
  • Concept: Adding 10 increases the tens digit by 1
  • Method: Start with 72, add 10 to get 82
  • Check: Verify 82 - 10 = 72 to confirm addition ✓

Common Mistakes

Avoid these frequent errors
  • Adding 10 to the ones place only
    Don't add 10 to just the ones digit (2) to get 12, making 712! This ignores place value completely. Always recognize that adding 10 increases the tens place by 1, changing 72 to 82.

Practice Quiz

Test your knowledge with interactive questions

If we have 85 blocks in total, how many blocks will remain if we remove 4 tens and 1 one?

FAQ

Everything you need to know about this question

Why does adding 10 change the tens place and not the ones place?

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Because 10 has a 1 in the tens place and 0 in the ones place. When you add 72 + 10, you're really adding (70 + 2) + (10 + 0) = 80 + 2 = 82.

What's the easiest way to add 10 to any number?

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Just increase the tens digit by 1! For 72, the tens digit is 7, so it becomes 8, giving you 82. The ones digit stays the same.

How can I check if 82 is the right answer?

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Use subtraction to check addition! If 72 + 10 = 82, then 82 - 10 should equal 72. Since it does, your answer is correct!

Does this work for bigger numbers too?

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Yes! Adding 10 to any number just increases the tens place by 1. For example: 345 + 10 = 355, or 1,267 + 10 = 1,277.

What if I see this problem written as 10 + 72?

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The answer is still the same! Addition is commutative, which means 72 + 10 = 10 + 72 = 82. Order doesn't matter in addition.

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