`425 × 1475 + 425 × 525`

`= 425 × (1475 + 525)`

`= 425 × 2000`

`= 850.000`

`25000 :  20 : 50`

`= 1250 : 50`

`= 25`

`1500 -  876  - 124`     

`= 624 - 124`

`= 500`

`2789 – 1799 + 799`

 `= (2789 - 1799) + 799`

`= 990 + 799`

`= 1789`

`257 × 105 - 257 - 257 × 4`   

`= 257 × (105 - 1 - 4)`

`= 257 × 100`

`= 25700`

`5400 + 3000 - 600`                

`= 5400 + (3000 - 600)`

`= 5400 + 2400`

`= 7800`

`312 × 425 + 312 × 574 + 312`

`= 312 × 425 + 312 × 574 + 312 × 1`

`= 312 × (425 + 574 + 1)`

`= 312 × 1000`

`= 312000`

`456 × 11 - 400 - 56`

`= 5016 - 456`

`= 4560`

`#mc`