Kirsten's work is shown below:


1 x 1.75 = 1.75

10 x 1.75 = 10.75

100 x 1.75 = 100.75

1,000 x 1.75 = 1,000.75


This is the correct pattern:


1 x 1.75 = 1.75

10 x 1.75 = 17.5

100 x 1.75 = 175

1000 x 1.75 = 1,750


What was her mistake?