Question

778×994=(778×1000)-(778×_)-778​

Answer 1

=>
778×994 =(778×1000)-(778×x)-778
=>
now take common 778 in Rhs
=>
778(1000-x-1) = 778×994
999-x = (778×994/)778
=>
1000-x = 994
-X = 994-999
X = 5 Ans

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Answer 2

We must be aware of distributive property before we solve the problem :

• a × (b + c) = a × b + a × c
• a × (b - c) = a × b - a × c
• a × (b + c + d) = a × b + a × c + a × d

We use this property to solve the given problem :

∴ 778 × 994 = 778 × (1000 - 6)

= 778 × 1000 - 778 × 6

= 778 × 1000 - 778 × (5 + 1)

= 778 × 1000 - 778 × 5 - 778 × 1

= 778 × 1000 - 778 × 5 - 778

So, 5 fills the mentioned blank.