The improvement of the second grade topic

1. Avoid duplication

Randomly calculates a set of random numbers, compares the second problem with the first operand, and if two operands are found to be exactly the same, delete this set of random numbers and re-pair the edges until there is no duplicate array at the end.

2. Customizable

Controls the number of printed questions per line and the number of all arithmetic questions to control the print format

3. Is there a multiplication method

After the topic randomly appears, all operation symbols are fed into an array, then retrieved, and queried for the multiplication number.

4. Range of values

The value of the random number ranges from 0-99, so the result will not exceed 200.

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The improvement of the second grade topic