Rearrange numbers in the descending order
6.5, 12.4, 15.6, 13.9, 9.9, 4.3

In this problem, all numbers have one digit after the decimal point.

When comparing decimals with the same digits after the decimal point, the one with the larger whole number part is larger.

If the whole number parts are also the same, compare the tenths place (the first digit after the decimal point).

Comparing the leftmost digit, we can see that 15.6 has the highest digit among all six numbers.

If the decimal places are the same, continue comparing digits to the right.

Among 6.5, 12.4, 13.9, 9.9, and 4.3, 13.9 has the highest digit.

Finally, we compare the whole number before the decimal point. 12.4 has a higher digit than 6.5, 9.9, and 4.3.

Therefore, arranging these numbers in descending order gives us: 15.6, 13.9, 12.4, 9.9, 6.5, and 4.3.

Can you summarize what you’ve understood in the above steps?

This is incorrect because it has the numbers in ascending order

15.6, 12.4, 9.9, 6.5

This is incorrect because the numbers 12.4 and 4.3 are not in the correct order

13.9, 15.6, 9.9, 6.5

This is the only one that correctly arranges all the numbers in descending order

15.6, 13.9, 12.4, 9.9, 6.5, 4.3

This is incorrect because the number 9.9 is placed before 6.5, breaking the descending order

15.6, 13.9, 12.4, 6.5, 4.3

Option

C

Can you summarize what you’ve understood in the above steps?