How do you get 100 using numbers from 1 up to 9?

F and L are the first and last letters in the set. And our numbers have to be the same number apart from each other. Our numbers 1 through 9 are. That’s almost half of 100 so we can multiply that by 2 and get 90 and now we can add back in another 1 and 9 to give the extra 10 needed to reach 100.

How do you make a number with 100?

Using the numerals 1,7,7,7 and 7 (a “1” and four “7”s) create the number 100. As well as the five numerals you can use the usual mathematical operations +, −, ×, ÷ and brackets (). For example: (7+1) × (7+7) = 112 would be a good attempt, but not right, because it is not 100.

What is the sum of the square of the digit from 1 to 9?

1+4+9+16+25+36+49+64+81=285 is sum of squares of digit from 1 to 9.

How many numbers do you need to add to 100?

Our numbers 1 through 9 are. That’s almost half of 100 so we can multiply that by 2 and get 90 and now we can add back in another 1 and 9 to give the extra 10 needed to reach 100. So if we go back over what we have so far. Well, the way I did this is I first looked at how much adding the numbers 1 through nine would be.

What two numbers have to be the same to reach 100?

And our numbers have to be the same number apart from each other. Our numbers 1 through 9 are. That’s almost half of 100 so we can multiply that by 2 and get 90 and now we can add back in another 1 and 9 to give the extra 10 needed to reach 100. So if we go back over what we have so far.

How do you write 100 using only +- or 2 digit numbers?

Here are some ways to write the number 100 using only +- or 2 digit numbers.: 1 + 2 + 3 – 4 + 5 + 6 + 78 + 9 = 100. 12 + 3 – 4 + 5+ 67 + 8 + 9 = 100. 1 +2 + 3 – 4+ 5 + 6 + 78 + 9 = 100. Approved by eNotes Editorial Team.

How to add up numbers quickly for estimation?

1) Adding up numbers quickly can be useful for estimation. Notice that the formula expands to this: Let’s say you want to add the numbers from 1 to 1000: suppose you get 1 additional visitor to your site each day – how many total visitors will you have after 1000 days? Since thousand squared = 1 million, we get million / 2 + 1000/2 = 500,500.