Name: ________ Date:_________
Finding the unknown value (S28)
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1
1
1
–
7
=
4
8
2
2
–
1
=
5
6
3
2
–
x
=
5
3
12
4
x
–
1
=
1
4
12
5
3
–
x
=
7
4
5
20
6
x
–
1
=
4
5
3
15