Complete the following exercise:
91:31=?
To solve the division of the fractions 91 and 31, we'll employ the method of "invert and multiply":
- Step 1: Identify the reciprocal of the divisor. The divisor is 31, and its reciprocal is 13.
- Step 2: Convert the division into a multiplication. Therefore, 91÷31 becomes 91×13.
- Step 3: Carry out the multiplication of the two fractions.
91×13=9×11×3=93.
- Step 4: Simplify the resulting fraction.
93 simplifies to 31 by dividing both the numerator and the denominator by their greatest common divisor, which is 3.
Therefore, the solution to the problem 91÷31 is 31.