The correct difference is 36. 1. When Xiao Ming did subtraction, he misspelled 9 on the minuend into 6, and misspelled 6 on the right side of the decimal point of the minuend into 9. The final difference is 32.832.8 (9-6) (9-6) × 0.1= 36.1. The calculation rule of multiplication: the numbers are aligned, starting from the right, and the first factor is multiplied by the number of digits in each number of the second factor in turn. When the multiplicand meets the joint operation of large numbers such as 989697, the periodic method is: the last digit of the multiplicand is supplemented by 10, and the first digit is fixed by 9. When the first digit is 6, 7 and 8, the number of complements is supplemented by 9 (all times of complements are low-order complements), and finally the first digit of the multiplier is subtracted once. For example: 9798 x 8679 = 85036842 (the complement of 8679 is 132 1). Order: the lower order of multiplier 8 is added to 2642 to get 979-82642; The ten digits 9 of the multiplicand are fixed; Add 2642 to the lower order of multiplier 7 to get 9-8246842; Subtract 132 1 from the first bit of the multiplier to get 85036842 (product).

The wrong number is 8.

What's wrong with mom?