Eureka 7

Write algebraic expressions to represent descriptions involving addition and subtraction

• Why do we use variables to represent numbers?

• What words can describe an addition expression? What words can describe a subtraction expression?

We can describe expressions using our math vocabulary, use variables to represent unknown numbers and write expressions to represent descriptions.

Multiple Choice

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

Jada is 6 years old, how old is Blake?

• 10 years old

• 11 years old

• 12 years old

• 13 years old

Multiple Choice

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

Jada is 7 years old, how old is Sasha?

• 5 years old

• 9 years old

• 10 years old

• 12 years old

Multiple Choice

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

Blake is 17 years old, how old is Jada?

• 12 years old

• 13 years old

• 14 years old

• 15 years old

Multiple Choice

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

If Sasha is 10 years old, how old is Jada?

• 7 years old

• 8 years old

• 12 years old

• 14 years old

Multiple Choice

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

Using the relationship between Jada, Blake, and Sasha's ages, if Jada's age is represented by j, what expression represents Blake's age?

• j + 2

• j + 5

• j - 2

• j - 5

Multiple Choice

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

Using the relationship between Jada, Blake, and Sasha's ages, if Jada's age is represented by j, what expression represents Sasha's age?

• j + 2

• j - 2

• j + 5

• j - 5

Multiple Choice

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

If Blake's age is represented by b, what is Sasha's age in terms of b?

• b - 5

• b - 7

• b + 5

• b + 7

Math Response

 Jada’s brother Blake was born 5 years before Jada. Jada’s sister Sasha was born 2 years after

Jada.

What is the value of s when Sasha is 16 years old? (number only)

Type answer here

Correct Answer: 16

Deg^°

Rad

Multiple Choice

What is the algebraic expression for "x plus 8"?

• 8 + x

• x - 8

• 8 - x

• x / 8

Drag and Drop

The algebraic expression "8 + x" can be described in words as

Placeholder

.

Drag these tiles and drop them in the correct blank above

8 less than a number x

The sum of 8 and a number x

x subtracted from 8

The difference between x and 8

Match

Match the following expressions with their correct description

• 8 - 3

• 3 + 8

• 8 - 7

• 7 - 8

8 minus 3

the sum of 3 and 8

the difference between 8 and 7

8 less than 7

• 8 minus 3

• the sum of 3 and 8

• the difference between 8 and 7

• 8 less than 7

Multiple Choice

What does the algebraic expression "x - 8" signify?

• x divided by 8

• x plus 8

• x minus 8

• The sum of x and 8

Multiple Choice

How can "8 - x" be described in words?

• 8 multiplied by a number x

• x subtracted from 8

• The sum of 8 and a number x

• 8 divided by a number x

Multiple Choice

What is the algebraic expression for the sum of p and 3?

• p - 3

• 3p

• p + 3

• 3 / p

Multiple Choice

How would you write the difference between 7 and an unknown number n as an algebraic expression?

• n - 7

• 7 + n

• 7n

• 7 - n

Multiple Choice

If $$\frac{5}{4}$$ is added to a number g, which of the following represents the algebraic expression?

• g + $$\frac{4}{5}$$

• 5g + 4

• $$\frac{5}{4}$$ + g

• 4g + 5

Drag and Drop

The algebraic expression for 9.95 minus t is

Placeholder

.

Drag these tiles and drop them in the correct blank above

t - 9.95

9.95t

9.95 + t

9.95 - t

Multiple Choice

How is one-half subtracted from a number d expressed algebraically?

• d + 1/2

• 1/2d

• d - 1/2

• 1/2 - d

Multiple Choice

Which expression represents a number c added to 3.6?

• c - 3.6

• 3.6c

• 3.6 + c

• c / 3.6

Multiple Choice

What is the algebraic expression for 4 more than an unknown number y?

• y - 4

• 4y

• y + 4

• 4 / y

Multiple Choice

If you have 25 less than z, which algebraic expression would you use?

• z + 25

• 25 - z

• z - 25

• 25z

Multiple Choice

How do you express a increased by 6 in algebraic terms?

• a - 6

• 6a

• a + 6

• 6 / a

Word Cloud

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Multiple Choice

Which expression corresponds to b decreased by 10?

• b + 10

• 10 - b

• b - 10

• 10b

Dropdown

What is the algebraic expression for w fewer than 35?

Select answer

Multiple Choice

How would you write the total of 8, 10, and a number v as an algebraic expression?

• 8v + 10

• 8 + 10v

• 8 + 10 + v

• v - 18

Multiple Select

Leo is 3 years older than Eddie. Let e represent Eddie's age in years. Which algebraic expressions represent Leo's age in years? Choose all that apply.

• e + 3

• e - 3

• e

• 3 + e

• 3 - e

Multiple Choice

Write an algebraic expression to represent the description: The sum of a number x and one-half.

• x + 1/2

• x - 1/2

• 1/2 - x

• 2x + 1

Multiple Choice

Suppose Sana is 10 years old. Which numerical expressions represent Lisa's age in years? Choose all that apply.

• 10 - 8

• 10 - 2

• 10 + 2

• 8

Multiple Choice

Complete the table. In the last row, write an algebraic expression to represent Lisa's age and Eddie's age. Sasha's age is represented by s in that row.

• s - 2 for Lisa's age and s + 4 for Eddie's age

• s + 2 for Lisa's age and s - 4 for Eddie's age

• s for Lisa's age and s + 2 for Eddie's age

• 2s for Lisa's age and s + 6 for Eddie's age

Multiple Select

Which descriptions of the algebraic expression 5 - y are correct? Choose all that apply.

• 5 less than y

• 5 subtracted from y

• 5 fewer than y

• 5 decreased by y

• 5 minus y

Draw

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Multiple Select

Which descriptions of the algebraic expression y − 5 are correct? Choose all that apply.

• 5 less than y

• 5 subtracted from y

• 5 fewer than y

• 5 decreased by y

• 5 minus y

Multiple Choice

For the expression that represents the description "10 subtracted from a number x", which is the correct algebraic expression?

• x + 10

• 10 − x

• x − 10

• −x + 10

Multiple Choice

Which algebraic expression represents "4 more than a number x"?

• x + 4

• x − 4

• 4 − x

• −x + 4

Multiple Choice

What is the algebraic expression for "The sum of a number x and 12"?

• x − 12

• x + 12

• 12 − x

• 12 + x

Match

Match the following expressions with their equivalent forms.

• t - 6

• 6t

• 6 + t

• t / 6

Subtracting 6 from t

Multiplying t by 6

Increasing t by 6

Dividing t by 6

• Subtracting 6 from t

• Multiplying t by 6

• Increasing t by 6

• Dividing t by 6

Multiple Choice

How would you write 1 more than a number m in algebraic expression?

• m - 1

• 1/m

• m + 1

• 1 - m

Multiple Choice

What is the expression for one-fourth subtracted from a number c?

• c + 1/4

• c - 1/4

• 4c

• c / 4

Dropdown

If you have the total of 2.5, 9, and a number t, which expression would represent this?

Select answer

Fill in the Blanks

What is the product of 8.12 and 0.8?

Explanation Slide...

Math Response

What is the product of 3.74 and 0.6?

Type answer here

Correct Answer: 2.244

Deg^°

Rad

Explanation Slide...

Math Response

What is the product of 9.17 and 0.3?

Type answer here

Correct Answer: 2.751

Deg^°

Rad

Explanation Slide...

Multiple Choice

Which equation correctly represents the statement: "−10 is 10 units from 0 on a number line"?

• (−10) = 10

• −10 = 10

• [10] = −10

• |−10| = 10

Explanation Slide...

The absolute value of -10 is 10.

Poll

How do you feel about the math we did today?

• I've got this!

• Pretty good

• It is even harder than order of opera

• I am so lost