The quotient is 7, that is, the dividend is 7 times the divisor. If the divisor is regarded as 1, there are seven divisors. Subtract quotient 7 from 55 to get 48, 48 is the sum of dividend and divisor, 48÷(7+ 1)=6 is divisor, and 6×7=42 is dividend.

There is a rule in division: when there is no remainder, the dividend is the quotient multiple of the divisor, so we can know that 55-7 = 48,48/(7+1+= 6 (divisor).

6*7=42 (dividend)

Integer multiplication algorithm for extended data;

(1) number alignment. Starting from the right, multiply the first factor by the number on each bit of the second factor, and the end of the number will be aligned with which bit of the second factor.

(2) Then add up the numbers multiplied several times.

(Multiply with 0 at the end of an integer: you can multiply the number before 0 first, then see how many zeros are at the end of each factor, and add a few zeros at the end of the multiplied number. )