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a)
13 x 2 x 25 =
13 x (2 x 25) =
13 x 50 = 650
50 x 13 x 2 =
(50 x 2) x 13 =
100 x 13 = 1300
b)
4 x 76 x 25 =
(4 x 25) x 76 =
100 x 76 = 7600
2 x 45 x 50 =
(2 x 50) x 45 =
100 x 45 = 4500
c)
4 x 16 x 50 =
(4 x 50) x 16 =
200 x 16 = 3200
15 x 38 x 2 =
(15 x 2) x 38 =
30 x 38 = 1140
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