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To find the sum of 1 to 10, it helps to rearrange them, so instead of thinking of it like: 1 + 2 + . . . + 9 + 10, think like this: (1+10) + (2+9) + (3+8) + (4+7) + (5+6) = 11 + 11 + 11 + 11 + 11 = 5 x 11 = 55.

So you have 5, which is 10/2 times 11 which is 10+1.

Now to sum 1 to N, it is: (1 + N) + (2 + N-1) + (3 + N-2) + ... = (1+N) + (1+N) + ...., and you do that for N/2 times, so the answer is (1+N)*N/2.

So for:

- N = 100 : 101*100/2 = 5050,
- N=1000 : 1001*1000/2 = 500500.

Q: How do you find the total of 1to 10 1to 100 1to 1000?

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You write 1-1000 as "One to One Thousand."

1^(1) = 1

Let's see313233033435363738393So there are 11 numbers from 1-100 that have a 3.

The sum of 2 and 97 is 99.

11. 10, 20, 30, 40, 50, 60, 70, 80 and 90 have One 0's each plus the number 100 has Two 0's hence making the total as 11.

Related questions

You write 1-1000 as "One to One Thousand."

20.

1to 100

738 numbers

1^(1) = 1

Let's see313233033435363738393So there are 11 numbers from 1-100 that have a 3.

The sum of 2 and 97 is 99.

11. 10, 20, 30, 40, 50, 60, 70, 80 and 90 have One 0's each plus the number 100 has Two 0's hence making the total as 11.

Divide the number by 2, you get 50, 100/2= 50. Now put another 50 near the number 50. You get 5050, that is the answer. This is applicable to 1 to 10, 1to 100, 1 to 1ooo & so on.-jagadisancs Mail ID: jagadisancs@gmail.com

it equals 10,000

the multiples of 9 between 1 and 100 are: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99

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