1

Problem

Rearrange numbers in the descending order:

1.2 , 5.5 , 3.3 , 6.9 , 7.7.

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 7.7 has the highest digit among all five numbers.

6

Step

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

7

Step

Among 1.2, 5.5, 3.3, and 6.9, 6.9 has the highest digit.

8

Step

Finally, we compare the whole number before the decimal point. 5.5 has a higher digit than 1.2 and 3.3.

9

Solution

Therefore, arranging these numbers in descending order gives us: 7.7, 6.9, 5.5, 3.3, and 1.2.

10

Sumup

Please summarize steps

Choices

11

Choice-A

It is correct because it includes all the numbers in the correct descending order

Correct 7.7, 6.9, 5.5, 3.3, 1.2

12

Choice-B

This option is incorrect because it does not maintain the descending order of the numbers

Wrong 7.7, 5.5, 3.3, 1.2

13

Choice-C

This option leaves out 3.3, so it does not include all the original numbers, which makes it incorrect

Wrong 7.7, 6.9, 5.5, 1.2

14

Choice-D

This option does not include all the numbers (5.5 and 1.2 are missing). Since it is incomplete, it cannot be correct

Wrong 7.7, 6.9, 3.3

15

Step

Option

A

16

Sumup

Please summarize choices