Write this number in standard form.

1 x 1 + 8 x 1/100 + 9 x 1/1000,

The answer is 1.089.

solution: 1 x 1 + 8 x 1/100 + 9 x 1/1000 As per the rule of order of operations i. e. division, multiplication, addition and subtraction, it will become: = 1 x 1 + 8 x 0.01 + 9 x 0.001 = 1 + 0.08 + 0.009 = 1.08 + 0.009 = 1.089 Answer will be 1.089