Arrange the numbers 876, 1909, 1650 and 869 in ascending numbers.

 Ascending order means arranging the number in increasing order.

The given numbers are 876, 1909, 1650 and 869.

Three-digit numbers 876 and 869 are smaller than four-digit numbers 1909 and 1650.

Now compare 876 and 869, 

The values at the hundreds place of numbers are the same i.e., 8.

The values at the tens place of numbers are 7 < 6, which means 869 < 876.

Now compare 1909 and 1650.

The values at the thousands place of numbers are the same i.e., 1.

The values at the hundreds place of numbers are 9 < 6, which means 1650 < 1909. 

Therefore, the ascending order is 869 < 876 < 1650 < 1909.