3.9-7 ?
3.9 - 7 = -3.1
at the Del school, there are twice as many 4th graders as 5th graders, There are three times as many 6th graders as 5th graders, the total number of 4th, 5th, and 6th graders at the scool is 264. how many 4yh graders are scool? A 52 B 82 C 35 D 88
82
-3.1
X 5th graders
2x 4th grades
3x 6 graders
Total = 264
x + 2x + 3x = 264
6x = 264
x = 44
2x = 2 * 44 = 88 - 4th graders.
To calculate the difference between 3.9 and 7, you need to subtract 7 from 3.9. Here's how you can do it:
Step 1: Write down the numbers one below the other, with the minus sign:
3.9
- 7
Step 2: Since the number 7 is larger than 3.9, you need to perform a "borrowing" operation. To do this, move the decimal point one place to the right on both numbers:
3.9
- 7.0
Step 3: Now subtract the two numbers as you would with whole numbers:
3.9
- 7.0
--------
-3.1
So, the difference between 3.9 and 7 is -3.1.