Place Value

A. 30 is correct because the digit 3 is in the tens place, so it represents 3 × 10 = 30.

Why the others are wrong:
- B (400): That's the value of the 4, which is in the hundreds place.
- C (5): That's the value of the 5, which is in the ones place.
- D (10): This confuses the place value; 10 is the place itself, not the digit's value.

Why A is correct:
The digit 5 is in the hundreds place in 4503, so its value is 5 × 100 = 500.

Why the others are wrong:
- B (4000): That's the value of the digit 4 (in the thousands place)
- C (10): That's the value of the 0 (in the tens place); also 10 isn't even a place value here
- D (3): That's the digit in the ones place, not the 5

A. 2 — CORRECT

In any number, place values go from right to left: ones, tens, hundreds, thousands. In 2105, the 2 is in the leftmost position, which is the thousands place.

B. 1 — Wrong

The 1 is in the hundreds place, not thousands.

C. 0 — Wrong

The 0 is in the tens place, not thousands.

D. 5 — Wrong

The 5 is in the ones place, not thousands.

• A. 4 is correct — In any number, the tens place is the second digit from the right. In 2345, that's 4.

• B. 5 is wrong — This is in the ones (units) place, the rightmost position.

• C. 3 is wrong — This is in the hundreds place, the third digit from the right.

• D. 2 is wrong — This is in the thousands place, the leftmost digit.

Correct answer: A (7)

The units place is the rightmost digit in a number—it represents the "ones." In 1987, reading from right to left, the 7 is in the rightmost position, so it's in the units place.

Why the others are wrong:
- B (1): This is in the thousands place (the leftmost digit)
- C (9): This is in the hundreds place
- D (8): This is in the tens place