multiply using shortcut merthod 1)71x9 2)55x7 3) 99x7 4)73x7 5) 64x5
Answers
Step-by-step explanation:
Solution :-
1)
Given that 71×9
=> 71×(10-1)
=>(71×10)-(71×1)
=> 710-71
=> 639
or
71×9
=> (70+1)×9
=>(70×9)+(1×9)
=> 630+9
=> 639
71×9 = 639
Used Property :- Distributive Property
2)
Given that 55×7
=> (50+5)×7
=>(50×7)+(5×7)
=> 350+35
=> 385
or
55×7
=> (60-5)×7
=>(60×7)-(5×7)
=> 420-35
=> 385
55×7 = 385
Used Property :- Distributive Property
3)Given that 99×7
=>(100-1)×7
=>(100×7)-(1×7)
=> 700-7
=> 693
99×7 = 693
Used Property :- Distributive Property
4)Given that 73×7
=> 73×(10-3)
=>(73×10)-(73×3)
=> 730-219
=> 511
or
73×7
=> (70+3)×7
=>(70×7)+(3×7)
=> 490+21
=> 511
73×7 = 511
Used Property :- Distributive Property
5)
Given that 64×5
=> (60+4)×5
=>(60×5)+(4×5)
=> 300+20
=> 320
64×5 = 320
Used Property :- Distributive Property
Distributive Property:-
If a, b c are any real numbers then a×(b+c) = (a×b)+(a×c) is called Distributive Property.
Answer:
Refer the attachment for solution:)
