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Earn +20 ptsQ: What is 11x9?
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What does 11x9 equal?
99
which is equl to 11x9?
9x11
What is 11x8?
11x1=11 11x2=22 11x3=33 11x4=44 11x5=55 11x6=66 11x7=77 11x8=88 11x9=99 11x10=111 Get the point?
What are first 12 prime numbers?
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37
Is the sum of digits in any multiple of 9 will add to 9?
No, that is not true. While many do, such as 18: 1+8=9. 72: 7+2=9. 117: 1+1+7 = 9, we look at 11x9 which is 99. The sum of the digits is 18. Of course if we look at much larger multiples of 9, such as 111x9 we can easily see this is not always true. We can look at the first 10 multiples of 9 not including 0, we have 9, 18, 27,36,45, 54, 63, 72, 81, 90 all of which are numbers whose digits that add up to 9. So it works for multiples of 9 less than 99 because that is the next multiple and the first one that fails.
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