Question

Estimate each of the following products by rounding off the first number downwards and the second number upwards 356×278

Answer 1

Answer:

Answer:

Step-by-step explanation:

356 x 278

472 x 76

578 x 369

356 x 278

= (300 + 56)(300 - 22)

= 90000 + 300(56 -22) - 56 *22

= 90000 + 300(34) - 56*22

= 90000 + 10200 - 1232

= 98968

472 * 76

= (400 + 72)(100 -24)

= 40000 - 400 * 24  + 100*72  - 24 * 72

= 40000 - 9600 + 7200 - 1728

= 35872

578 * 369

= (500 + 78) * (400 - 31)

= 200000 - 500*31 + 78*400  - 78*31

= 213282

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