7 hundreds, 3 tens, and 15 ones is what number?
The Correct Answer and Explanation is:
To find the number represented by 7 hundreds, 3 tens, and 15 ones, we break the number into parts and then combine them:
- 7 hundreds = 700
- 3 tens = 30
- 15 ones = 15
Now, add them together:
700 + 30 + 15 = 745
So, the correct number is 745.
Explanation
When breaking a number down by place value, each digit represents a specific amount based on its position. In this case, the number is given in terms of hundreds, tens, and ones. Understanding how to combine them accurately helps in developing number sense, especially in early mathematics.
Let’s begin with 7 hundreds. The digit 7 in the hundreds place means 7 multiplied by 100, which is 700.
Next, we have 3 tens. Each ten is worth 10, so 3 tens means 3 multiplied by 10, which gives 30.
Now comes the important part — 15 ones. Normally, the ones place can go from 0 to 9. However, in this case, we have more than 9 ones. When the number of ones is greater than 9, we regroup them. Ten ones make 1 ten. So, from 15 ones, we can take 10 of them and change that into 1 ten, leaving 5 ones.
So, 15 ones = 10 + 5 = 1 ten and 5 ones.
Now, add the extra ten to the original 3 tens:
3 tens + 1 ten = 4 tens = 40.
Now let’s add everything together again with the regrouped value:
- Hundreds: 700
- Tens: 40
- Ones: 5
700 + 40 + 5 = 745
This method shows both the direct addition and the regrouping process, helping to reinforce place value understanding. The final answer remains 745.
