Question

Firoz used box method of multiplication to find the product of 21 and 17. Replace all the alphabets(A,B,C,D) with the corresponding numbers.

x	20	A
10	B	10
C	140	D

• A. A = 1, B = 2, C = 3, D = 4
• B. A = 1, B = 200, C = 1, D = 4
• C. A = 1, B = 200, C = 7, D = 7
• D. A = 7, B = 20, C = 140, D = 100

Answer 1

The correct option is C A = 1, B = 200, C = 7, D = 7

The correct representation of box method of multiplication for 21 x 17 is as shown:

x	20	1
10	200	10
7	140	7

So the missing numbers are,
A = 1
B = 200
C = 7
D = 7