Find the following values without a calculator.
Give your answers in this manner. (Eg 1, 2, 3, 4)

(a) 91 x 5 + 8 x 91 = _____ x 91
(b) 10 x 7 + 7 x 5 + 7 x 4 = _____ x 7 + 3 x 7
(c) 122 x 19 - 5 x 122 = _____ x 122
(d) 11 x 4 + 7 x 4 - 7 x 4 = 14 x 4 - 4 x _____
(a)
91 x 5 + 8 x 91 = _____ x 91
5 x 91 + 8 x 91 = _____ x 91
(5 + 8) x 91 = _____ x 91

13 x 91 =  _____ x 91

(b)
10 x 7 + 7 x 5 + 7 x 4 = _____ x 7 + 3 x 7
(10 + 5 + 4) x 7 = = _____ x 7 + 3 x 7
19 x 7 = _____ x 7 + 3 x 7
19 x 7 - 3 x 7 = _____ x 7
(19 - 3) x 7 = _____ x 7

16 x 7 = _____ x 7

(c)
122 x 19 - 5 x 122 = _____ x 122
(19 - 5) x 122 = _____ x 122

14 x 122 = _____ x 122

(d)
11 x 4 + 7 x 4 - 7 x 4 = 14 x 4 - 4 x _____
(11 + 7 - 7) x 4 = 14 x 4 - _____ x 4
11 x 4 = 14 x 4 - _____ x 4
14 x 4 - 11 x 4 = _____ x 4
(14 - 11) x 4 = _____ x 4

3 x 4 = _____ x 4

Answer(s): 13, 16, 14, 3