Solve Addition Problem: Adding 5 Units to 15

Addition with Single-Digit Numbers

What number will we get if we add 5 units to the number 15?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

What number will we get if we add 5 units to the number 15?

2

Step-by-step solution

The problem requires us to add 5 units to the number 15. To solve this, we will use simple addition. Here is the step-by-step process:

  • Step 1: Identify the numbers we are working with. We have the number 15.
  • Step 2: We need to add 5 to 15.
  • Step 3: Perform the addition: 15+5 15 + 5 .

This addition can be computed as follows:
- Start from 15, and count 5 numbers forward: 16, 17, 18, 19, and finally 20.
Thus, 15+5=20 15 + 5 = 20 .

Therefore, the number we get after adding 5 units to 15 is 20 20 .

The answer matches choice 3.

3

Final Answer

20 20

Key Points to Remember

Essential concepts to master this topic
  • Rule: When adding, combine the quantities to find the total
  • Technique: Count forward from 15: 16, 17, 18, 19, 20
  • Check: Verify by counting back from 20 to reach 15 ✓

Common Mistakes

Avoid these frequent errors
  • Misunderstanding what "adding units" means
    Don't think "adding 5 units" means anything different from regular addition = confusion and wrong answers! This is just fancy language for basic addition. Always treat "adding units" as simple addition: 15 + 5 = 20.

Practice Quiz

Test your knowledge with interactive questions

If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?

FAQ

Everything you need to know about this question

What does "adding 5 units" mean exactly?

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"Adding 5 units" is just another way of saying add 5! It's the same as 15 + 5. The word "units" just emphasizes that we're adding 5 individual items or numbers.

Is there a difference between adding units and regular addition?

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No difference at all! Whether the problem says "add 5" or "add 5 units," you do exactly the same thing: 15 + 5 = 20.

How can I double-check my addition?

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Try these methods: 1) Count forward on your fingers, 2) Use the reverse: 20 - 5 should equal 15, or 3) Break it down: 15 + 5 = 15 + 5 = 20.

What if I get confused by the wording of math problems?

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Look for the key math words! "Add," "plus," "combine," "total," and "sum" all mean addition. Focus on the numbers and the operation, not fancy language.

Why do some problems use "units" instead of just saying "add 5"?

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Math problems sometimes use different words to help you think about what you're counting. Whether it's units, objects, or just numbers, addition works the same way!

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