Round off 1.94155 to thousands, when you place each of the decimal fraction into their place value you will discover that 9 is tenth, 4 is hundredth and 1 is thousandth. Since the number that follows 1 being the thousandth is 5 you will need to round up 5 to become 1 and add to the 1 in thousandth to become 2. Therefore the answer is 1.942