a/7 x 42/a

To simplify the expression a/7 x 42/a, we can follow these steps:

Step 1: Simplify the numerator (top part) of the expression.
The numerator, a/7, does not have any common factors that can be canceled out, so it remains the same.

Step 2: Simplify the denominator (bottom part) of the expression.
The denominator, 42/a, can be simplified by canceling out the common factor of "a" between the numerator and denominator. When we cancel out the "a" in the denominator, the expression becomes 42.

Step 3: Write the simplified expression.
After simplifying the numerator and denominator, the expression becomes:
a/7 x 42 = a x 1/7 x 42 = a x 6 = 6a

Therefore, the simplified expression is 6a.