Name: ________ Date:_________
Finding the unknown value (A39)
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1
3
+
1
=
7
10
2
2
+
3
=
3
7
3
3
+
x
=
14
5
15
4
x
+
1
=
1
1
4
12
5
3
+
x
=
1
5
4
3
12
6
x
+
3
=
1
4
3
5
15