Which of the following statements is not true?

A. 1.7 greater than 1 and 1/2

B. 3/4 less than or equal to 7/8

C. - 1 and 1.5 less than - 1.5

D. 0.01 less than 0.1

A. 1 1/2 is equal to 1.5, so this is true

B. 3/4 is equal to 0.75 and 7/8 is equal to 0.875, this is true

C. - 1.5 is less than both - 1 and 1.5, this is false

D. 0.01 is less than 0.1, this is true

So the answer to your question is C