Mr. R.’s World of Math

When Thief heard my answer,
A strange thing did pass,
He flipped upside down,
And started talking real fast…
This time, I realized,
My answers would make,
Thief get real hyper,
Until he might break!
He said 18 quick,
Like a cheetah can run,

I gave him a smile,
Multiplication is fun!
I told him his questions,
His Number Thief tricks,
Were easy like 18,
Is 3 times a ____