What is (21-1)\times (-20) ?

The solution to (21-1)\times (-20) is -400

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(21-1)\times (-20)

(21 - 1) \cdot (- 20)

- 400

Solution steps

(21 - 1) (- 20)

Follow the PEMDAS order of operations

Calculate within parentheses

(21 - 1) : 20

21 - 1

21 - 1 = 20

= 20

= 20 (- 20)

Multiply and divide (left to right)

20 (- 20) : - 400

20 (- 20)

Apply rule

a \cdot (- b) = - a \cdot b

20 (- 20) = - 20 \cdot 20 = - 400

= - 400

= - 400

4^{5} - 5^{4}

\frac{17}{18} \cdot 3 + 1

- 2 \times (- 29 + 45)

60 - (\frac{- 5}{2} \times 1)

- 6 + 9 - 3