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Q: How do you figure out the sum of the first 25 odd numbers without doing 1 3 5 and so on?

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It is the first figure that's not a zero. This applies to all numbers.

To figure the variance on a group of numbers, you must first figure out the mean, which is the average of the set. Then, substract the mean from each number in the set. Square the result of those substractions, and then average the squares. You will then have the variance.

you can if you are doing experiments

large numbers

First of all you need to figure out what it is NOT doing, then tell the people who you are asking for help.

go along to the line number of the first 2 numbers and then go up to the line with the second 2 numbers

The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1". The first figure to be discarded is 4. As this is less than 5 then the previous figure (7) remains unchanged. 2.8749 to the nearest hundredth is 2.87

Negative numbers do not show up much in the real world unless someone is trying to figure out a problem. The numbers were first discovered by the Indian civilization.

The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1". The first figure to be discarded is 5 and following the above rule : 0.115 becomes 0.12 when rounded off the 2sf

The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1". In this case the first figure to be discarded is 3 therefore the previous figure (2) remains unchanged. 239 rounded to the nearest 100 is 200.

This will be difficult to answer accurately without knowing each set of numbers.

You can figure out the "composite numbers" from any table of primes - all the positive integers that are not prime numbers are composite (the number one should also be excluded). The first four composite numbers are:4, 6, 8, 9

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