How do you do this?

This is from my brother's homework. He is in 4th grade.

I want to make 99 using my calculator, but the 9 key, the + key, and the - key are broken. How can I use my calculator to do this task?

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Shade70 · 51-55, M

Type two 6's and turn the calculator upside down :D

fluteacorn · 22-25, F

Very... Creative...

Shade70 · 51-55, M

Gotta think outside the box. (And someone already had 33x3 listed so I thought I'd go for unique...)

fluteacorn · 22-25, F

@Shade70: That's true. :D

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Groofydorkgerdo · 56-60, M

In parenthesis input 5 plus 4

fluteacorn · 22-25, F

That wouldn't make 99.

Groofydorkgerdo · 56-60, M

It would make 9. the number that is broken on the calculator.
Oh waiti didnt see the plus and minus signs being broken.
33 times 3 the

LoveChild · 26-30, F

3 x 3

fluteacorn · 22-25, F

That is only 9.

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