Addition with Place Value: Adding 3 Tens and 4 Units to 55

Place Value Addition with Tens and Units

What number do we get if we add 3 tens and 4 units to the number 55?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

What number do we get if we add 3 tens and 4 units to the number 55?

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Add the 3 tens to the number 55.
  • Step 2: Add the 4 units to the result from Step 1.

Let's work through each step:

Step 1: We need to add three tens to 55. Three tens equal 3×10=303 \times 10 = 30.
Thus, adding 30 to 55 gives us:

55+30=8555 + 30 = 85

Step 2: Now, we add the 4 units to the result of Step 1 (which is 85).
Adding 4 gives us:

85+4=8985 + 4 = 89

Therefore, the solution to the problem is 89 89 .

3

Final Answer

89 89

Key Points to Remember

Essential concepts to master this topic
  • Place Value Rule: Add tens to tens position, units to units position
  • Technique: 3 tens = 30, so 55 + 30 = 85, then 85 + 4 = 89
  • Check: Count: 5 tens + 3 tens = 8 tens, 5 units + 4 units = 9 units ✓

Common Mistakes

Avoid these frequent errors
  • Adding 3 and 4 directly to 55
    Don't add 3 + 4 = 7 to get 62! This ignores that 3 represents 3 tens (30), not 3 units. The tens and units have different place values. Always convert tens to their actual value first: 3 tens = 30, then add 30 + 4 = 34 to the original number.

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 '3 tens' actually mean in numbers?

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3 tens means 30! Each ten is worth 10, so 3 tens = 3×10=30 3 \times 10 = 30 . It's like having 3 groups of 10 objects each.

Why can't I just add 3 + 4 + 55?

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Because place value matters! The '3' represents 3 tens (30), not 3 units. You need to add 30 + 4 + 55 = 89, not 3 + 4 + 55 = 62.

Is there a faster way to do this problem?

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Yes! Think of it as one addition: 55 + 34 = 89. Since 3 tens and 4 units = 34, you can add them together first, then add to 55.

How can I check if 89 is the right answer?

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Break down 89 into place values: 8 tens and 9 units. Starting with 55 (5 tens, 5 units), we added 3 tens and 4 units. Check: 5 + 3 = 8 tens, 5 + 4 = 9 units ✓

What if the units add up to more than 9?

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Great question! If units exceed 9, you regroup (carry over). For example: 7 units + 6 units = 13 units = 1 ten and 3 units. Add that extra ten to the tens column!

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