Correct Answer - Option 2 : 7125
Concept used :-
Trick to multiply two numbers ending in 5 with difference of 20 between them.
Method :-
- Write 125 at the end.
- Add 1 to ten’s place of the bigger number.
- Now multiply the increased digit with the ten’s digit of the smaller number.
- Write the product so obtained on the left side of 125
Calculation :-
Let the product be A125
A = (9 + 1) × 7 = 70 (step 2 and 3)
_ 1 2 5
7 0 _ _
7 1 2 5 (Final answer)
