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2 The hidden rules are in the addition table. Answer the following
questions.
⑴ What is the greatest and the least number in the addition table?
⑵ What are the properties of numbers in the ?
⑶ What are the properties of the two parts that divided by the ?
⑷ Look at the results in the addition table and find the numbers that appeared
the most and the fewest times?
4. Speed mini-addition 43
questions.
⑴ What is the greatest and the least number in the addition table?
⑵ What are the properties of numbers in the ?
⑶ What are the properties of the two parts that divided by the ?
⑷ Look at the results in the addition table and find the numbers that appeared
the most and the fewest times?
4. Speed mini-addition 43
