Addition with Tens and Units: Finding Components That Sum to 68

Q: Why is 6 + 80 wrong if it also equals a number with 6 and 8?

Great question! 6 + 80 = 86, not 68. The position of digits matters! In 68, the 6 is in the tens place (worth 60) and 8 is in the units place.

Q: How do I know which digit represents tens and which represents units?

In any two-digit number, the left digit is always tens and the right digit is always units. So in 68: 6 is tens (= 60), 8 is units (= 8).

Q: What if I see 61 + 7? That also has 6 and something else.

Yes, but 61 + 7 = 68 is correct math! However, this isn't tens and units addition. We need exactly one number representing tens (like 60) plus units (like 8).

Q: Why is this method useful for addition?

Breaking numbers into tens and units makes mental math easier! You can add the tens together, add the units together, then combine. It's the foundation for adding larger numbers.

Place Value Addition with Expanded Form

Which addition exercise using tens and units results in 68?

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Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

Which addition exercise using tens and units results in 68?

Step-by-step solution

To solve the given problem, follow these steps:

Step 1: Identify the tens component of the number 68. The digit in the tens place is 6, which is equivalent to 60 in terms of tens.
Step 2: Identify the units component of the number 68. This is simply the remaining part after the tens, which is 8.
Step 3: Verify that adding these components will result in the given number. Calculate $60 + 8$ to confirm:

$60 + 8 = 68$

Therefore, the addition exercise using tens and units that results in 68 is $60 + 8$ .

Among the given choices, the correct one for this problem is Choice 2: $60 + 8$ .

Final Answer

$60+8$

Key Points to Remember

Essential concepts to master this topic

Rule: Break numbers into tens and units for easy addition
Technique: Identify 68 as 60 (tens) + 8 (units)
Check: Add components back together: 60 + 8 = 68 ✓

Common Mistakes

Avoid these frequent errors

Confusing tens place value with actual tens
Don't think the tens digit 6 equals 6 tens = only 6! The digit 6 in the tens place represents 60. Always remember that place value determines the true value of each digit.

Practice Quiz

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What number do the blue squares below represent?

FAQ

Everything you need to know about this question

Why is 6 + 80 wrong if it also equals a number with 6 and 8?

Great question! 6 + 80 = 86, not 68. The position of digits matters! In 68, the 6 is in the tens place (worth 60) and 8 is in the units place.

How do I know which digit represents tens and which represents units?

In any two-digit number, the left digit is always tens and the right digit is always units. So in 68: 6 is tens (= 60), 8 is units (= 8).

What if I see 61 + 7? That also has 6 and something else.

Yes, but 61 + 7 = 68 is correct math! However, this isn't tens and units addition. We need exactly one number representing tens (like 60) plus units (like 8).

Can any number be written as tens plus units?

Absolutely! Every two-digit number can be split this way. For example: 45 = 40 + 5, 92 = 90 + 2. It's called expanded form!

Why is this method useful for addition?

Breaking numbers into tens and units makes mental math easier! You can add the tens together, add the units together, then combine. It's the foundation for adding larger numbers.

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