For ninety-nine (9 × 9), you can remember in the following order. · Ninety-nine for Learn from the basics · Aloud trying to practice the ninety-nine - by solving the problem, try to understand properly
Although ninety-nine is also intended will remember memorize, but it is no good to be still firmly understand the basics.
First, learn the basics, then to practice, let's solve the problem that can verify that you understand exactly.
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