civonamzuk

Thanks, Melody! It is interesting.

Roller a/        2*3.14*11=69.115

Roller b/        3*3.14*7 =65.973

I'll let you chose the right answer.

Go ahead, show me.

The sum of numbers from 0 ==> 9  is divisible by  9;

0+1+2+3+4+5+6+7+8+9 = 45                 45 / 9 = 5 

Let's take year  1776;

1776-21=1755                   1755/9=195

This is true for all multi digit numbers starting with # 10;

10-1=9                9/9=1

78-15=63           63/9=7

358-16=342        342/9=38

486,372,103 - 34 = 486,372,069                   486,372,069 / 9 = 54,041,341

The question is:  Why is this so?

I don't have the right answer to this question, but what I see from these examples is that the #9 has a 'special' place in a structure of multi digit numbers.

$${\mathtt{\,-\,}}{{\mathtt{4}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{5}} = -{\mathtt{11}}$$

$${\left(-{\mathtt{4}}\right)}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{5}} = {\mathtt{21}}$$

how do i put 6 and a half in the calculator

                    6+1/2

36 divided by 116 in fraction form

$${\frac{{\mathtt{36}}}{{\mathtt{116}}}} = {\frac{{\mathtt{9}}}{{\mathtt{29}}}}$$

$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{10}} = {\sqrt{{\mathtt{361}}}}$$

or

$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{10}} = {\sqrt[{{\mathtt{3}}}]{{\mathtt{6\,859}}}}$$

Circumference(C)      diameter(d)     pi = 3.14159

                C = d*pi

You're welcome, Melody! I've never done fractions the way you did.