Multiplication by two digit number :

Multiplication of 24 and 17.

Step – 1. Multiply the two right hand unit digits, vertically, that is,

4×7 = 28. Write down 8 and carry over 2.

2 4

I

1 7

_____

28

(4×7)

Step 2. Multiply 7 by 2 and 1 by 4, crosswise, and add these two product together, i.e. 7×2 = 14 and 1×4 = 4, 14 + 4 =18, 18 + 2 =20.

Write down 0 and carry over 2.

2 4

X

1 7

__________

20 28

(2×7 + 1×4) + 2

Step – 3. Multiply the two left hand most digits, vertically, that is,

1×2= 2, 2 + 2 ( carry digit ) = 4 Write down 4 as the left hand most digit to give the final answer 408.

2 4

I

1 7

________

42028

(2×1) +2