99 and three fourths + 199 and three fourths + 2999 and three fourths + 3999 and three fourths with ladder equation

99 and three fourths + 199 and three fourths + 2999 and three fourths + 3999 and three fourths with ladder equation

99 and three quarters + 199 and three quarters + 2999 and three quarters + 3999 and three quarters
=100-1/4+200-1/4+3000-1/4+4000-1/4
=100+200+3000+4000-1
=7299

Simple calculation of 9.99 * 111 + 3.33 * 667

9.99*111+3.33*667
=3.33×3×111+3.33×667
=3.33×（333+667）
=3.33×1000
=3330

Simple operation of 4.2 × 99 + 4.2

4.2×（99＋1）＝420

Simple calculation: 1 / 2 * 99 + 99 * 1 / 2=
It's not a simple calculation, it's a direct answer

Original formula = (1 / 2 + 1 / 2) × 99 = 99