What is longmult 400*45 ?

The solution to longmult 400*45 is 18000

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Multiply 400*45

long multiplication

400 \cdot 45

18000

Solution steps

400 \cdot 45

Line up the numbers

\times 40405

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 40405

Mutliply the bold numbers:

0 \cdot 5 = 0

\frac{\times 4 0 4 0 5}{0}

Mutliply the bold numbers:

0 \cdot 5 = 0

\frac{\times 4 0 4 0 5}{0 0}

Mutliply the bold numbers:

4 \cdot 5 = 20

Carry

2

to the column on the left and write

0

in the result line

\frac{\times 2 4 0 4 0 5}{0 0 0}

Add the carried digit,

2

, to the result

\frac{\times 2 4 0 4 0 5}{2 0 0 0}

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

\frac{\times 4 0 4 0 5}{2 0 0 0}

Mutliply the bold numbers:

0 \cdot 4 = 0

\frac{\times 4 0 4 0 5}{2 0 0 0 0}

Mutliply the bold numbers:

0 \cdot 4 = 0

\frac{\times 4 0 4 0 5}{2 0 0 0 0 0}

Mutliply the bold numbers:

4 \cdot 4 = 16

Carry

1

to the column on the left and write

6

in the result line

\frac{\times 1 4 0 4 0 5}{2 6 0 0 0 0 0}

Add the carried digit,

1

, to the result

\frac{\times 1 4 0 4 0 5}{1 2 6 0 0 0 0 0}

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

\frac{\times 4 0 4 0 5}{0 1 2 6 0 0 0 0 0 0}

2000 + 16000 = 18000

+ 0126000000