# Math Help - Some Tips

1. About black triangles, if someone wants to use $\blacktriangleright$ or $\blacktriangleleft$ just click on the image

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Now watch

$\frac{2}{6} = \frac{2}{{2 \cdot 3}} = \frac{{\mathop {\rlap/2}\limits^1 }}{{\mathop {\rlap/2}\limits_1 \cdot 3}} = \frac{1}{3}.$

Really cool, isn't it? I made it with MathType. To generate the cross line, you gotta put {\rlap/}. See the code above.

2. Krizalid you so good, are you sure you are not Japanese?

3. You actually had written this:

Krizalid you so good at LaTeX that even those crazy Japanese people would be jealous of your skill
I'm chilean!

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I like LaTeX, and I like help on it.

4. I had made up this way to cancel fractions . . .

. . $\frac{\not4^2}{\not6_3} =\frac{2}{3}$ . . . \frac {\not4 ^2} {\not6 _3} = \frac{2}{3}

But I really like your "rlap" code . . . it's looks much better!

. . $\frac{\rlap/4 ^2}{\rlap/6 _3}$ . . \frac{\rlap/4 ^2} { \rlap/6 _3}

Let me try something: . frac{1{\rlap/9}} {{\rlap/9}5} = \frac{1}{5}

. . $\frac{1{\rlap/9}}{{\rlap/9}5} =\frac{1}{5}$ . . . . . Ha! It works!

5. the thing is, i could not make the strike through go through two symbols, for instance, if you wanted to strike through (cancel) 19, you'd have to do one strike for the 1 and one for the 9. does anyone know how to go through two or more symbols at a time, or am i just being too picky?

6. Originally Posted by Jhevon
the thing is, i could not make the strike through go through two symbols, for instance, if you wanted to strike through (cancel) 19, you'd have to do one strike for the 1 and one for the 9. does anyone know how to go through two or more symbols at a time, or am i just being too picky?
I was just browsing around and found some interesting information on this. I saw an example where x - x was canceled out by a diagonal line and had a 0 in the upper right corner.

I couldn't find code for it, but the article mentioned using the "cancel package." So.......

@MathGuru: Do we have the cancel package loaded into the site?

-Dan

7. Originally Posted by topsquark
@MathGuru: Do we have the cancel package loaded into the site?
I told him the same thing the last time, but looks like he didn't read it

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