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Chapter 19: Teaching—the 9x9 Times Table
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... ble—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 9x9 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 multiplication sign, and means the process of calculating by multiplying. It's simpler this ...
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