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THOANTHOAN
THOANTHOAN
Think of a number…Think of a number…
THOANTHOAN
Think of a number…Think of a number…
Multiply it by 3Multiply it by 3
THOANTHOAN
Think of a number…Think of a number…
Multiply it by 3Multiply it by 3
Add 7Add 7
What is your answer?What is your answer?
x x
Think of a number…Think of a number…
3x3x
Think of a number…Think of a number…
Multiply it by 3Multiply it by 3
3x + 7 =3x + 7 =
Think of a number…Think of a number…
Multiply it by 3Multiply it by 3
Add 7Add 7
To find the number you first thought To find the number you first thought of, go backwards through this of, go backwards through this PowerPoint presentation and PowerPoint presentation and undoundo the calculations you madethe calculations you made
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x x
Think of a number…Think of a number…
5x5x
Think of a number…Think of a number…
Multiply it by 5Multiply it by 5
5x - 2 =5x - 2 =
Think of a number…Think of a number…
Multiply it by 5Multiply it by 5
Subtract 2Subtract 2
What is your answer?What is your answer?
Try another oneTry another one
x x
Think of a number…Think of a number…
10x10x
Think of a number…Think of a number…
Multiply it by 10Multiply it by 10
10x + 5 =10x + 5 =
Think of a number…Think of a number…
Multiply it by 10Multiply it by 10
Add 5Add 5
What is your answer?What is your answer?
Try another oneTry another one
x x
Think of a number…Think of a number…
2x2x
Think of a number…Think of a number…
Multiply it by 3Multiply it by 3
2x + 30 =2x + 30 =
Think of a number…Think of a number…
Multiply it by 2Multiply it by 2
Add 30Add 30
What is your answer?What is your answer?
Try another oneTry another one
x x
Think of a number…Think of a number…
5x5x
Think of a number…Think of a number…
Multiply it by 5Multiply it by 5
5x - 1 =5x - 1 =
Think of a number…Think of a number…
Multiply it by 5Multiply it by 5
Take away 1Take away 1
What is your answer?What is your answer?
Try another oneTry another one
x x
Think of a number…Think of a number…
9x9x
Think of a number…Think of a number…
Multiply it by 9Multiply it by 9
9x - 7 =9x - 7 =
Think of a number…Think of a number…
Multiply it by 9Multiply it by 9
Take away 7Take away 7
What is your answer?What is your answer?
Try another oneTry another one
x x
Think of a number…Think of a number…
X + 3X + 3
Think of a number…Think of a number…
Add 3Add 3
4(x + 3) =4(x + 3) =
Think of a number…Think of a number…
Add 3Add 3
Multiply by 4Multiply by 4
What is your answer?What is your answer?
Solving EquationsSolving Equations
What you are doing is solving What you are doing is solving equations.equations.
Here’s a nice way to set out your Here’s a nice way to set out your work…..work…..
Simple EquationsSimple Equations
5x + 17 = 625x + 17 = 62(Take 17 from both sides)(Take 17 from both sides)
5x = 455x = 45(Divide both sides by 5)(Divide both sides by 5)
x = 9x = 9
Simple EquationsSimple Equations
3x + 8 = 293x + 8 = 29(Take 8 from both sides)(Take 8 from both sides)
3x = 213x = 21(Divide both sides by 3)(Divide both sides by 3)
x = 7x = 7
Simple EquationsSimple Equations
6x - 5 = 556x - 5 = 55(Add 5 to both sides)(Add 5 to both sides)
6x = 606x = 60(Divide both sides by 6)(Divide both sides by 6)
x = 10x = 10
Now try these:Now try these:
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