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a)
x 3 = 30
= 30 : 3
= 10
10 x 3 = 30
6 x = 42
= 42 : 6
= 7
6 x 7 = 42
x 8 = 64
= 64 : 8
= 8
8 x 8 = 64
9 x = 63
= 63 : 9
= 7
9 x 7 = 63
b)
3 : = 1
= 1 x 3
= 3
3 : 3 = 1
5 : = 5
= 5 : 5
= 1
5 : 1 = 5
21 : = 7
= 21 : 7
= 3
21 : 3 = 7
27 : = 3
= 27 : 3
= 9
27 : 9 = 3
c)
: 8 = 6
= 6 x 8
= 48
48 : 8 = 6
: 2 = 7
= 7 x 2
= 14
14 : 2 = 7
: 10 = 4
= 4 x 10
= 40
40 : 10 = 4
: 7 = 7
= 7 x 7
= 49
49 : 7 = 7
d)
3 x = 6 x
3 x 6 = 6 x 3
2 x = 3 x
2 x 3 = 3 x 2
4 x = 6 x
4 x 6 = 6 x 4
8 x = 4 x
8 x 4 = 4 x 8
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