Q., 9 \Xd7 9 =, 2 \Xd7 20 =, 4 \Xd7 5 =

Q.

9 × 9 =
2 × 20 =
4 × 5 =

 

9 × 9

= 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9

= 18 + 18 + 18 + 18 + 9

= 36 + 36 + 9

= 72 + 9

= 81

--------------

20 × 2

= 20 + 20

= 40

--------------

4 × 5

= 4 + 4 + 4 + 4 + 4

= 8 + 4 + 4 + 4

= 12 + 4 + 4

= 16 + 4

= 20

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