1

Problem

Rearrange numbers in the descending order:

6.5 , 12.4 , 15.6 , 13.9 , 9.9 , 4.3.

2

Step

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

3

Hint

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

4

Clue

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

5

Step

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

6

Step

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

7

Step

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

8

Step

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

9

Solution

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

10

Sumup

Please summarize steps

Choices

11

Choice-A

This is incorrect because it has the numbers in ascending order

Wrong 15.6, 12.4, 9.9, 6.5

12

Choice-B

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

Wrong 13.9, 15.6, 9.9, 6.5

13

Choice-C

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

Correct 15.6, 13.9, 12.4, 9.9, 6.5, 4.3

14

Choice-D

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

Wrong 15.6, 13.9, 12.4, 6.5, 4.3

15

Step

Option

C

16

Sumup

Please summarize choices