What is longmult 12*15 ?

The solution to longmult 12*15 is 180

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longmult 12*15

long multiplication

12 \cdot 15

180

Solution steps

12 \cdot 15

Line up the numbers

\times 1125

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 1125

Mutliply the bold numbers:

2 \cdot 5 = 10

Carry

1

to the column on the left and write

0

in the result line

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

Add the carried number to the multiplication:

1 + 1 \cdot 5 = 6

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

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

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

Mutliply the bold numbers:

2 \cdot 1 = 2

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

Mutliply the bold numbers:

1 \cdot 1 = 1

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

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

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

60 + 120 = 180

+ 016200

Add the digits of the bolded column:

0 + 0 = 0

\frac{+ 0 1 6 2 0 0}{+ 0}

Add the digits of the bolded column:

6 + 2 = 8

\frac{+ 0 1 6 2 0 0}{+ 8 0}

Add the digits of the bolded column:

0 + 1 = 1

\frac{+ 0 1 6 2 0 0}{+ 1 8 0}

= 180

= 180

0.5

0.2 \cdot 60

\frac{13}{52}

(2 + 4)^{2}

8 \cdot 2 (2 + 2)