What is longmult 15*20 ?

The solution to longmult 15*20 is 300

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15*20

long multiplication

15 \cdot 20

300

Solution steps

15 \cdot 20

Line up the numbers

\times 1250

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 1250

Mutliply the bold numbers:

5 \cdot 0 = 0

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

Mutliply the bold numbers:

1 \cdot 0 = 0

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

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

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

Mutliply the bold numbers:

5 \cdot 2 = 10

Carry

1

to the column on the left and write

0

in the result line

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

Add the carried number to the multiplication:

1 + 1 \cdot 2 = 3

\frac{\times 1 1 2 5 0}{3 0 0 0}

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

\frac{\times 1 2 5 0}{0 3 0 0 0 0}

0 + 300 = 300

= 300

\frac{13}{12}

\frac{80}{2}

8.5

7.9

\frac{25}{12}