What is longmult 15*13 ?

The solution to longmult 15*13 is 195

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Multiply 15*13

long multiplication

15 \cdot 13

195

Solution steps

15 \cdot 13

Line up the numbers

\times 1153

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 1153

Mutliply the bold numbers:

5 \cdot 3 = 15

Carry

1

to the column on the left and write

5

in the result line

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

Add the carried number to the multiplication:

1 + 1 \cdot 3 = 4

\frac{\times 1 1 1 5 3}{4 5}

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

\frac{\times 1 1 5 3}{4 5}

Mutliply the bold numbers:

5 \cdot 1 = 5

\frac{\times 1 1 5 3}{4 5 5}

Mutliply the bold numbers:

1 \cdot 1 = 1

\frac{\times 1 1 5 3}{1 4 5 5}

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

\frac{\times 1 1 5 3}{0 1 4 5 5 0}

45 + 150 = 195

+ 014550

Add the digits of the bolded column:

5 + 0 = 5

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

Add the digits of the bolded column:

4 + 5 = 9

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

Add the digits of the bolded column:

0 + 1 = 1

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

= 195

= 195

1.25 \cdot 4

\frac{55}{9}

\frac{1600}{8}

(80/4 \cdot (2 - 4)) /40

\frac{280}{2}