Writing Expressions

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Writing Expressions

• Lesson 1-11

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Why do we need to know how to write expressions?

• It will help you to solve word problems.
• It will help you to read number sentences.

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NECESSARYVOCABULARY
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SUM

• The answer to an addition problem
• This may tell you that you need to put two
  numbers in parentheses.

The sum of p and 3
p 3
(p 3)
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DIFFERENCE

• The answer to a subtraction problem
• This may tell you that you need to put two
  numbers in parentheses.

The difference of t and 7
t - 7
(t - 7)
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PRODUCT

• The answer to a multiplication problem

The product of s and 4
s 4
(s 4)
This is the most correct format in algebra. It
works because of the commutative property of
multiplication.
4s
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QUOTIENT

• The answer to a division problem

The quotient of s and 4
s 4
(s 4)
s/4
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Greater Than

• When you see greater than or more than
• Flip the numbers
• Add

5 more than z
5
z

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Less Than

• When you see less than
• Flip the numbers
• Subtract

8 less than w
8
w
-
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Words that mean EQUAL

• equal
• is
• yields
• gives

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Words that mean ADD

• sum
• more than
• added to
• plus
• in addition
• increase by
• altogether / all together
• combine together
• total of
• join
• and

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Words that mean SUBTRACT

• minus
• take away
• less than
• reduce by
• difference of
• fewer than
• decrease by

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Words that mean MULTIPLY

• multiplied by
• times
• of (especially with fractions)
• the product of
• twice (multiply by 2)
• thrice (multiply by 3)

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Words that mean DIVIDE

• per
• beats per minute
• a / an
• dollars an hour
• days a week
• out of
• ratio of
• quotient of
• percent
• divide by 100

• goes into
• divided into
• 2 divided into 8
• 8 22
• divided by
• 10 divided by 5
• 10 5

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Lets do some together
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6 less than k

• k - 6

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t divided by 8

• t 8
• or
• t
• 8

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m and 3 more

• m 3

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u less than 4

• 4 - u

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8 more than twice a number c

• 2c 8

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1 more than the product of n and 3
(n 3) 1
Algebraically, this is more correct

• 3n 1

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6 less than a number x

• x - 6

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3 times the sum of a number t and 15

• 3 ( t 15)

Algebraically, this is more correct
3(t 15)
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4 times the difference of y and 6
4 (y - 6)
Algebraically, this is more correct
4(y - 6)
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Excellent Website for more practice!

• Solving Math Word Problems
• Make sure you also try out exercises 1 and 2!