Final answer:
The Hindu-Arabic numeral 378 in expanded form is 300 + 70 + 8, which represents the hundreds, tens, and ones place values, respectively.
Step-by-step explanation:
The Hindu-Arabic numeral 378 in expanded form would be written as:
300 + 70 + 8
Explaining in more detail, we are breaking down the number 378 into its constituent place values. In this system, each digit is worth ten times the value of the digit to its right, which is based on the powers of 10. Therefore, the 3 in 378 is in the hundreds place and is equal to 3 times 100 (or 300), the 7 is in the tens place and is equal to 7 times 10 (or 70), and the 8 is in the ones place and represents just itself (or 8).