Solve Addition Problem: 85 + 5 Units

Basic Addition with Single Digits

What number will we get if we add 5 units to the number 85?

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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 85?

2

Step-by-step solution

To solve this problem, let's follow these steps:

  • Step 1: Identify the numbers involved in the addition.
  • Step 2: Perform the addition operation.
  • Step 3: Verify the final result with the given choices.

Now, let's work through each step:

Step 1: The given numbers are 85 (the base number) and 5 (the number to add).

Step 2: We'll perform the addition, 85+5 85 + 5 .

Performing the calculation:
85+5=90 85 + 5 = 90

Step 3: Among the listed answers, the choice that corresponds to our result is choice 2: 90 90 .

Therefore, the number we get by adding 5 to 85 is 90 90 .

3

Final Answer

90 90

Key Points to Remember

Essential concepts to master this topic
  • Rule: When adding to a two-digit number, add to ones place
  • Technique: For 85 + 5, add 5 to the 5 in ones place: 5 + 5 = 10
  • Check: Count forward from 85: 86, 87, 88, 89, 90 ✓

Common Mistakes

Avoid these frequent errors
  • Adding to the tens place instead of ones place
    Don't add 5 to the 8 in 85 to get 135! This happens when you don't identify place values correctly and leads to answers that are way too big. Always add single digits to the ones place of the original number.

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 can't I just add 5 to both digits in 85?

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Because that would change the place value! The 8 represents 80 (tens place) and the 5 represents 5 (ones place). You only add to the ones place when adding single digits.

What if adding to the ones place gives me more than 9?

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Great question! In this case, 5+5=10 5 + 5 = 10 , so you write down 0 in the ones place and carry the 1 to the tens place: 80 + 10 = 90.

How can I double-check my addition?

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Try counting up from the original number! Start at 85 and count: 86, 87, 88, 89, 90. You should reach your answer after counting 5 numbers.

Is there a faster way to do this in my head?

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Yes! Think of it as 85+5=80+5+5=80+10=90 85 + 5 = 80 + 5 + 5 = 80 + 10 = 90 . Break the original number into tens and ones, then add!

What if I accidentally chose 95 as my answer?

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You probably added 5 to both the 8 and the 5, getting 13 and 10. Remember: only add to the ones place when adding a single digit to a two-digit number.

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