What is 1.6 * 0.9? estimate and correct answer

1.6 is close to 1.5

0.9 is close to 1

So, multiple 1.5 and 1

1.5 * 1 = 1.5

1.5 is the estimated answer.

Correct answer

1.6 * 0.9 = 1.44

The awnser to 1.6 is 2 because 6 is greater than 5, and the awnser to 0.9 is 1 because 9 is greater than 5, but don't get me wrong if it was 5 it will still round up it just cant be less than 5, because if less than 5 it stays the same.