Transcript 3.4-3.5 English to Algebra

3.4-3.5 English to Algebra
Obj: to recognize math words
and to convert English to Math
Key Words
• Addition: get more, plus, increase by,
sum, more than, greater than, add
• Subtraction: less than, decreased by,
fewer than, deduct, subtract, minus,
difference
• Multiplication: product, times, of, double,
twice, triple
• Division: quotient, divide, divided by
• Equal: is, was
Example 1
• 9 decreased by 5
9-5
• 2 increased by 7
2+7
Example 2
5 more than 3
3+5
8 less than 12
12-8
Example 3
• A number increased by 7
X+7
• 7 increased by 5 times the number
7+5x
Example 4
The $340 price of a camera is $40 more
than 3 times the cost.
Let x = cost
340=40+3x
-40 -40
300=3x
3 3
x= 100 dollars
Example 5
Mr. Post’s weight decreased by 15 is 140.
Find my weight.
X= Post’s weight
x-15=140
+15 +15
x=155 lbs.
Example 6
Five less than two times a number is 75
Let x = the number
Less than flip sides
2x-5=75
+5 +5
2x=80
2 2
x=40
Example 7
If w=10ft
P=48ft
Find the L
Let x=length
P=2L+2w
48=2L+2(10)
48=2L+20
-20
-20
28=2L
2 2
L=14 ft