What is longmult 90*90 ?

The solution to longmult 90*90 is 8100

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longmult 90*90

long multiplication

90 \cdot 90

8100

Solution steps

90 \cdot 90

Line up the numbers

\times 9900

Multiply the top number by the bottom number one digit at a time starting with the ones digit (from right to left)

Multiply the top number by the bolded digit of the bottom number

\times 9900

Mutliply the bold numbers:

0 \cdot 0 = 0

\frac{\times 9 9 0 0}{0}

Mutliply the bold numbers:

9 \cdot 0 = 0

\frac{\times 9 9 0 0}{0 0}

Multiply the top number by the bolded digit of the bottom number

\frac{\times 9 9 0 0}{0 0}

Mutliply the bold numbers:

0 \cdot 9 = 0

\frac{\times 9 9 0 0}{0 0 0}

Mutliply the bold numbers:

9 \cdot 9 = 81

Carry

8

to the column on the left and write

1

in the result line

\frac{\times 8 9 9 0 0}{1 0 0 0}

Add the carried digit,

8

, to the result

\frac{\times 8 9 9 0 0}{8 1 0 0 0}

Add the rows to get the answer. For simplicity, fill in trailing zeros

\frac{\times 9 9 0 0}{0 8 0 1 0 0 0 0}

0 + 8100 = 8100

+ 08010000

Add the digits of the bolded column:

0 + 0 = 0

\frac{+ 0 8 0 1 0 0 0 0}{+ 0}

Add the digits of the bolded column:

0 + 0 = 0

\frac{+ 0 8 0 1 0 0 0 0}{+ 0 0}

Add the digits of the bolded column:

0 + 1 = 1

\frac{+ 0 8 0 1 0 0 0 0}{+ 1 0 0}

Add the digits of the bolded column:

0 + 8 = 8

\frac{+ 0 8 0 1 0 0 0 0}{+ 8 1 0 0}

= 8100

= 8100

\frac{13}{11}

4, 6

- 2 (- 1)^{2}

81 - 36

- 1^{2} + 1