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

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