What is longmult 40*40 ?

The solution to longmult 40*40 is 1600

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longmult 40*40

long multiplication

40 \cdot 40

1600

Solution steps

40 \cdot 40

Line up the numbers

\times 4400

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 4400

Mutliply the bold numbers:

0 \cdot 0 = 0

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

Mutliply the bold numbers:

4 \cdot 0 = 0

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

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

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

Mutliply the bold numbers:

0 \cdot 4 = 0

\frac{\times 4 4 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 4 0 0}{6 0 0 0}

Add the carried digit,

1

, to the result

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

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

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

0 + 1600 = 1600

+ 01060000

Add the digits of the bolded column:

0 + 0 = 0

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

Add the digits of the bolded column:

0 + 0 = 0

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

Add the digits of the bolded column:

0 + 6 = 6

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

Add the digits of the bolded column:

0 + 1 = 1

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

= 1600

= 1600

15 + 18

15 + (- 7) - (- 3)

0.04

3.6

40 \cdot 20