In the decimal numbering system, the digits are each in a place that indicates their value. The number 815 has:
* an 8 in the place indicating the number of hundreds, * a 1 in the place indicating the number of tens, * a 5 in the place indicating the number of ones. To "round to the nearest tens place" means to round the value of the places below the tens. In the number 815, this is only the digit 5. In a commonly used rounding system, all digits below 5 are rounded down to 0, and all digits above and including 5 are rounded up to the next place. 815 therefore rounds to 820. (814 would round to 810.)
Round then number 815 to the nearest ten
850
825
900
820
850
820
820 when the last # is 5 or higher round up
135.8333
815 - 15 = 800
All multiples of 815, which is an infinite number.
Suppose the principle is Y and the interest rate r. Then Y + 3rY = 815 Y + 4rY = 854 rY = 39 So Y + 3*39 = 815 Y = 815 - 3*39 = 815 - 117 = 698
815 rounded to the nearest tens is 820
820 when the last # is 5 or higher round up
800
820
800
815 in Roman numerals is DCCCXV.
815 = 815.0
1,5,163 and 815
% change= |815 - 925|/815 * 100%= 110/815 * 100%= 0.13496 * 100%= 13.5% (% increase)
135.8333
The percentage of 530 out of 815 is approximately 65%.
815 - 15 = 800