a) = 4 x 25 - 3 x 8 + 3
= 100 - 24 + 3
= 79
b) = 28 x (76 + 24 - 20)
= 28 x (100 - 20)
= 28 x 100 - 28 x 20
= 2800 - 560
= 2240
= 4 x 25 - 3 x 8 + 3
= 100 - 24 + 3
= 79
b) = 28 x (76 + 24 - 20)
= 28 x (100 - 20)
= 28 x 100 - 28 x 20
= 2800 - 560
= 2240