0.0667
I presume you don't mean 21 minus 13; that is easy enough, and equals 8. If you mean the ratio 13/21, all you do is divide. The answer is 0.1690___.
Just divide 13 by 16 - for example, on a calculator. This will give you the equivalent decimal.
Divide by 3, 7 and 13. 1, 3, 7, 13, 21, 39, 91, 273
To find the average, add up all the numbers and then divide the sum by the number of numbers you added. 7+11+21=39 39/3=13 The average is 13.
Divide 42 by 2 to give you 21.
0.0667
I presume you don't mean 21 minus 13; that is easy enough, and equals 8. If you mean the ratio 13/21, all you do is divide. The answer is 0.1690___.
1 x 21 3 x 7
The number halfway between 13 and 21 can be found by taking the average of the two numbers. Add 13 and 21 together to get 34, then divide by 2 to get 17. Therefore, the number halfway between 13 and 21 is 17.
0.0404
Add them together and divide by 6.
divide by 21
Just divide 13 by 16 - for example, on a calculator. This will give you the equivalent decimal.
Divide by 3, 7 and 13. 1, 3, 7, 13, 21, 39, 91, 273
Add the 4 numbers together and divide by 4, the answer is 17.
It is easy enough to divide by 3, to give the exact quotient as 7.3