2, continuous subtraction, such as: 95-28=? Subtract the number of the same part as the minuend (i.e. 1 unit is the minuend and 10 unit is the minuend), and then subtract the number of the subtracted part. Process: First use 95-25=70. Then use 70-3=67.
3. subtract first and then add. Such as: 76-38=? You can subtract the minus 38 from the integer 70, and then use this difference to add the digits of the minus.