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“Yes.” Mag smiled. He took a look at the neatly written stair-shaped table—the rows and columns were very orderly, and the handwriting was very clear. Then, he put down the pen. “It has nine rows and nine columns, so it’s called the 9×9 table. Amy has already learned the basics of addition and subtraction, so it won’t be very hard to learn this.”
“Then what’s that little cross in the middle?” asked Amy, pointing at the “x”, a little confused.
“It’s called the mu ...
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