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(20 + 5) x 4 = 100 ; 25 x 4 = 100
(2 + 18) x (4 + 1) = 100 ; 20 x 5 = 100
4 x (8 + 11) + (3 x 8) = 100 ; 4 x 19 + 24 = 76 + 24 = 100
12 x (7 + 5) - 4 x (7 + 4) = 100 ; 12 x 12 - 4 x 11 = 144 - 44 = 100
4 x (3 x 3 + 2 x 4 x 2) = 100 ; 4 x (9 + 16) = 4 x 25 = 100