Name: ________ Date:_________
Finding the unknown value (S21)
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1
3
–
1
=
4
2
2
3
–
1
=
5
3
3
4
–
x
=
7
5
15
4
x
–
1
=
4
3
15
5
2
–
x
=
7
3
5
15
6
x
–
1
=
1
3
6
2