Question

the digit 9 in which number represents a value of 90?
choose 1 answer:
a 95
b 953
c 729

Explanation:

Step1: Analyze digit place in 95

In 95, the 9 is in the tens place? No, wait, 95 is two - digit: 9 is in tens place? Wait, 910 + 51 = 95, so 9 is in tens place? Wait no, 9 is in the tens place? Wait 95: 9 is in the tens place? Wait 910=90? Wait no, 9 in 95 is in the tens place? Wait 95: 9 is in the tens place? Wait 910 = 90? Wait no, 95 is 9 tens and 5 ones. Wait 910=90? Wait no, 910 is 90, but 95 is 9 tens (90) and 5 ones (5). Wait but let's check other options.

Step2: Analyze digit place in 953

In 953, the 9 is in the hundreds place. So its value is 9*100 = 900.

Step3: Analyze digit place in 729

In 729, the 9 is in the ones place. So its value is 9*1 = 9.
Wait, wait, I made a mistake in Step1. Wait 95: 9 is in the tens place? Wait 910 = 90? Wait 95 is 9 tens (90) and 5 ones (5). But wait the option A is 95, option B is 953 (9 in hundreds place: 900), option C is 729 (9 in ones place: 9). Wait but the question is which digit 9 represents 90. So 90 is 910, so the 9 should be in the tens place. Wait 95: 9 is in tens place (910 = 90), 5 is in ones place (51 = 5). But wait let's re - check. Wait 95: 9 is in the tens place, so 910 = 90. But wait the options: A is 95, B is 953 (9 in hundreds: 900), C is 729 (9 in ones: 9). Wait but maybe I messed up. Wait no, 95: 9 is in the tens place, so 910 = 90. But wait the problem is to find which number's 9 represents 90. So 90 is 910, so the 9 must be in the tens place. Wait 95: 9 is in tens place (910 = 90), 953: 9 in hundreds (9100 = 900), 729: 9 in ones (91 = 9). Wait but the answer is A? Wait no, wait 95: 9 is in the tens place, so 9*10 = 90. But let's confirm:

For number 95:
The place value of 9: 9 is in the tens place. Place value = digit×place value of the place. Tens place has a place value of 10. So 9×10 = 90.

For number 953:
9 is in the hundreds place. Place value of hundreds place is 100. So 9×100 = 900.

For number 729:
9 is in the ones place. Place value of ones place is 1. So 9×1 = 9.

Answer:

A. 95