In the non-carry mental addition of 1-digit number and multi-digit number, mental arithmetic time differences lie in arithmetic time differences and integration time differences.
在一位数加多位数不进位加法口算中，口算时间差异主要源于运算时间差异和整合时间差异；
In the non-carry mental addition of 1-digit number and multi-digit number, mental arithmetic time differences lie in arithmetic time differences and integration time differences.
在一位数加多位数不进位加法口算中，口算时间差异主要源于运算时间差异和整合时间差异；
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