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How many odd numbers from 16 to 30?
How many odd numbers are there from 16 to 30? Seven {7} odd numbers
How many odd numbers are between 20 and 100?
There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.
What is the sum of the first 20 odd numbers?
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 + 25 + 27 + 29 + 31 + 33 + 35 + 37 + 39 = 400 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39 above are the first 20 odds If you add the first to the last you get 40 If you add the second to the second from last you get 40 It doesn't matter which numbers you add first so long as you add them all up there are 10 pairs of numbers totaling 40 so the sum is 400
7 odd numbers equal 40?
I don't believe this is possible. The formula for an odd number is (2n+1) where n is any integer. So, for seven odd numbers added together... {a,b,c,d,e,f,g are the integers) (2a +1) + (2b +1) + ... + (2g+1) = 2(a+b+c+d+e+f+g) + 7 = 2(h) + 7 h is an integer 2h + 7 must be an odd number, thus it can't equal 40
What is the answer when you add all numbers from 40 to 60?
The sum of the numbers 1 to 39 = 39 x 40 ÷ 2 = 780 The sum of the numbers 1 to 60 = 60 x 61 ÷ 2 = 1830 Therefore the sum of the numbers 40 to 60 = 1830 - 780 = 1050
