What is longmult 15*16 ?

The solution to longmult 15*16 is 240

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Multiply 15*16

long multiplication

15 \cdot 16

240

Solution steps

15 \cdot 16

Line up the numbers

\times 1156

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 1156

Mutliply the bold numbers:

5 \cdot 6 = 30

Carry

3

to the column on the left and write

0

in the result line

\frac{\times 3 1 1 5 6}{0}

Add the carried number to the multiplication:

3 + 1 \cdot 6 = 9

\frac{\times 3 1 1 5 6}{9 0}

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

\frac{\times 1 1 5 6}{9 0}

Mutliply the bold numbers:

5 \cdot 1 = 5

\frac{\times 1 1 5 6}{9 5 0}

Mutliply the bold numbers:

1 \cdot 1 = 1

\frac{\times 1 1 5 6}{1 9 5 0}

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

\frac{\times 1 1 5 6}{0 1 9 5 0 0}

90 + 150 = 240

+ 019500

Add the digits of the bolded column:

0 + 0 = 0

\frac{+ 0 1 9 5 0 0}{+ 0}

Add the digits of the bolded column:

9 + 5 = 14

\frac{+ 0 1 9 5 0 0}{+ 0}

Carry

1

to the column on the left and write

4

in the bolded column

\frac{+ 1 0 1 9 5 0 0}{+ 4 0}

Add the digits of the bolded column:

1 + 0 + 1 = 2

\frac{+ 1 0 1 9 5 0 0}{+ 2 4 0}

= 240

= 240

\frac{44}{5}

\frac{90}{28}

\frac{140}{8}

\frac{1500}{5}

\frac{88}{9}