Final answer:
To compare the numbers -1.6 and -1.2 using a number line, plot them on the number line and see their relative positions. Since -1.6 is closer to zero than -1.2, it is bigger.
Step-by-step explanation:
To compare the numbers -1.6 and -1.2 using a number line, we need to plot these numbers on the number line and see their relative positions. Since both numbers are negative, they will be to the left of zero on the number line. -1.6 is closer to zero than -1.2, so it is bigger. Therefore, the correct symbol to compare the numbers is >.