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