The answer is 864. The expanded form of a number is 800+60+4. The standard form of 800+60+4 will have three digits because the greatest number in expanded form has three digits. The first digit of the number in the standard form will be the number of hundreds which is 8 (800/100 = 8). The second digit of the number in the standard form will be the number of tens which is 6 (60/10 = 6). The third digit of the number in the standard form will be the number of ones which is 4 (4/1 = 4). So, 800+60+4 in the standard form is 864.
