How to calculate 199 plus 99 times 99?

199 plus 99 times 99
=199+99×99
=100+99+99×99
=100+99×100
=100×(1+99)
=100×100
=10000

What is 1024 times 15

1024 times 15
=1024×(10+5)
=1024×10+1024×5
=10240+5120
=15360

1024 times 625 times 1331 is equal to? (simple algorithm)

1024x625x1331=64x(16x625)x11x11x11=64x10000x11x11x11=704x11x11x10000=7744x11x10000=85184x10000=851840000
Note that multiplying a number by 11 is very simple, for example: 7744x11 = 7744x (10 + 1) = 77440 + 7744 = 85184

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