Place Value Practice: Converting 7 Tens and 2 Units to a Total Number

Q: Why is 7 tens worth 70 and not just 7?

Each ten represents a group of 10 ones! So 7 tens means 7 groups of 10, which equals $ 7 \times 10 = 70 $.

Q: What if I accidentally flip the numbers around?

Remember: tens always go in the left position and units go in the right position. Think of it like writing your age - the bigger place value comes first!

Q: Is there a pattern I can use?

Yes! Always multiply the tens digit by 10, then add the units digit. For any number with A tens and B units, the answer is $ (A \times 10) + B $.

Q: What if someone says it differently, like 'I have 7 in the tens place'?

That means exactly the same thing! Whether they say 7 tens or 7 in the tens place, you still multiply by 10 to get the value: $ 7 \times 10 = 70 $.

Place Value Conversion with Tens and Units

I have 2 units and 7 tens.

How much is that in total?

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Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

I have 2 units and 7 tens.

How much is that in total?

Step-by-step solution

To solve this problem, we'll carefully calculate the total as follows:

Step 1: Calculate the value represented by the tens place:
Since there are 7 tens, this contributes a value of $7 \times 10 = 70$ .
Step 2: Include the value of the units place:
Add the 2 units, which contribute $2$ .
Step 3: Combine these values:
The total is $70 + 2 = 72$ .

Therefore, the total when combining 2 units and 7 tens is $72$ .

Final Answer

$72$

Key Points to Remember

Essential concepts to master this topic

Rule: Multiply tens by 10 then add units value
Technique: 7 tens = 7 × 10 = 70, then add 2 units
Check: Count by tens: 10, 20, 30, 40, 50, 60, 70, then add 2 = 72 ✓

Common Mistakes

Avoid these frequent errors

Writing tens and units in wrong order
Don't write 2 tens and 7 units as 27! This reverses the place values and gives the wrong answer. Always remember that tens come first (left position), then units (right position).

Practice Quiz

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FAQ

Everything you need to know about this question

Why is 7 tens worth 70 and not just 7?

Each ten represents a group of 10 ones! So 7 tens means 7 groups of 10, which equals $7 \times 10 = 70$ .

What if I accidentally flip the numbers around?

Remember: tens always go in the left position and units go in the right position. Think of it like writing your age - the bigger place value comes first!

How can I double-check my answer?

Break it down step by step:

Count the tens: 10, 20, 30, 40, 50, 60, 70
Add the units: 70 + 2 = 72
Or use expanded form: $70 + 2 = 72$

Is there a pattern I can use?

Yes! Always multiply the tens digit by 10, then add the units digit. For any number with A tens and B units, the answer is $(A \times 10) + B$ .

What if someone says it differently, like 'I have 7 in the tens place'?

That means exactly the same thing! Whether they say 7 tens or 7 in the tens place, you still multiply by 10 to get the value: $7 \times 10 = 70$ .

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