1. 8
2 .20
3. 10
4. 56
5. 10
1.
LET X BE THE NUMBER
x + 4=12
change the operation
12-4=x
Solve
12 - 4= 8
2.
Let X be the number
x -9 =11
Change the Operation
11+9=x
3.
Let N be the number
5 x N =50
Change the operation
50÷5=N
50÷5=10
4.
N ÷ 7=8
7 x 8= N
7 x 8= 56
5.
X + 10= 20
20 - 10 = X
20 - 10= 10
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Answers & Comments
Independent Assessment
1. 8
2 .20
3. 10
4. 56
5. 10
EXPLANATION
1.
LET X BE THE NUMBER
x + 4=12
change the operation
12-4=x
Solve
12 - 4= 8
2.
Let X be the number
x -9 =11
Change the Operation
11+9=x
Solve
11+9=x
3.
Let N be the number
5 x N =50
Change the operation
50÷5=N
Solve
50÷5=10
4.
Let N be the number
N ÷ 7=8
Change the operation
7 x 8= N
Solve
7 x 8= 56
5.
Let X be the number
X + 10= 20
Change the operation
20 - 10 = X
Solve
20 - 10= 10
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