What is longmult 300*40 ?

The solution to longmult 300*40 is 12000

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Simplify 300*40

long multiplication

300 \cdot 40

12000

Solution steps

300 \cdot 40

Line up the numbers

\times 30400

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 30400

Mutliply the bold numbers:

0 \cdot 0 = 0

\frac{\times 3 0 4 0 0}{0}

Mutliply the bold numbers:

0 \cdot 0 = 0

\frac{\times 3 0 4 0 0}{0 0}

Mutliply the bold numbers:

3 \cdot 0 = 0

\frac{\times 3 0 4 0 0}{0 0 0}

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

\frac{\times 3 0 4 0 0}{0 0 0}

Mutliply the bold numbers:

0 \cdot 4 = 0

\frac{\times 3 0 4 0 0}{0 0 0 0}

Mutliply the bold numbers:

0 \cdot 4 = 0

\frac{\times 3 0 4 0 0}{0 0 0 0 0}

Mutliply the bold numbers:

3 \cdot 4 = 12

Carry

1

to the column on the left and write

2

in the result line

\frac{\times 1 3 0 4 0 0}{2 0 0 0 0 0}

Add the carried digit,

1

, to the result

\frac{\times 1 3 0 4 0 0}{1 2 0 0 0 0 0}

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

\frac{\times 3 0 4 0 0}{0 1 0 2 0 0 0 0 0 0}

0 + 12000 = 12000

+ 0102000000