work out 20.5 x 3.5

asked by guest
on Jan 14, 2025 at 8:12 pm



You asked:

Evaluate the expression: \(20.5 \cdot 3.5\)

MathBot Answer:

\[20.5 \cdot 3.5 = \frac{287}{4} = 71.75\]

\[\begin{aligned}20.5 \cdot 3.5& = \left(20 + \frac{5}{10}\right) \cdot \left(3 + \frac{5}{10}\right)\\& = \left(20 + \frac{1}{2}\right) \cdot \left(3 + \frac{5}{10}\right)\\& = \frac{41}{2} \cdot \left(3 + \frac{5}{10}\right)\\& = \frac{41}{2} \cdot \left(3 + \frac{1}{2}\right)\\& = \frac{41}{2} \cdot \frac{7}{2}\\& = \frac{287}{4}\end{aligned}\]

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