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 -40300=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 +15x=155 lbs.
Example 6
Five less than two times a number is 75
Let x = the number 2x-5=75Less than flip sides +5 +5
2x=80 2 2 x=40
Example 7Example 7
If w=10ft P=2L+2wP=48ft 48=2L+2(10)Find the L 48=2L+20 -20 -20
Let x=length 28=2L 2 2L=14 ft
Top Related