Fourth grade primary school recursive equation calculation (can skillfully calculate to skillfully calculate) urgent! Tell me if I can do it skillfully. If I can, do it skillfully. If I can't, leave it alone 99×199+99+199 67×9＋99×3 （632×5＋632×2＋632）×125

99×199+99+199
=99×（199+1）+199
=99×200+199
=19999
67×9＋99×3
=67×9+9×11×3
=9×（67+33）
=9×100=900
（632×5＋632×2＋632）×125
=632×（5+2+1）×125
=632×8×125
=632×1000
=632000

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