think of a number multiply it by 2 add 8 divide by 2 subtract the number you started with what is...
TRANSCRIPT
Think of a numberThink of a number
Multiply it by 2Multiply it by 2
Add 8Add 8
Divide by 2Divide by 2
Subtract the number you started with
Subtract the number you started with
What is your answer?What is your answer?
Mind reading
4
Mind reading
Think of a numberThink of a number
Add 3Add 3
Double itDouble it
Subtract it againSubtract it again
Subtract the number you first thought of
Subtract the number you first thought of
What is your answer?What is your answer?
Mind reading
6
Mind reading
Everybody started with different numbers, but ended up with the same number. Why?
The number you first thought of is always eventually subtracted.
Everyone has performed the same operations so you all end up with the same answer.
Mind reading
Think of a number
Think of a number
n
Mind reading
Multiply it by 3Multiply it by 3
3n
Mind reading
Add 14Add 14
3n + 14
Mind reading
Subtract the number you first thought of
Subtract the number you first thought of
2n + 14
Mind reading
Divide by 2Divide by 2
n + 7
Mind reading
Subtract the number you first thought of
Subtract the number you first thought of
7
Mind reading
3n is an expression.3n is an expression.
3n + 8 is an expression with two terms.
3n + 8 is an expression with two terms.
An expression consists of one or more terms.
Expressions
Think of a Number
• Double it
• Add 3
• Multiply by 4
• Subtract 12
• Divide by 8.
Think of a Number
• Double it
• Add 20
• Subtract original number
• Subtract 5
• Subtract original number.
Think of a Number
• Add 4
• Subtract 3
• Add 9
• Subtract original number.
Think of a Number
• Add 8
• Double it
• Subtract original number
• Subtract 1
• Subtract original number.
Think of a Number
• Add 3
• Double it
• Subtract original number
• Add 1
• Subtract original number.
Think of a Number
• Add 2
• Treble it
• Subtract original number
• Halve it
• Subtract original number
• Add 4.
• Think of a number• Double it
• Add 3• Multiply by 4• Subtract 12• Divide by 8
• n
• 2n
• 2n+3
• 8n+12
• 8n
• n