Mrs Davis Algebra Intro

Writing Expressions

100

If an unknown number is n, what is 2 more than the unknown number?

n + 2

200

If an unknown number is n, what is 3 less than the unknown number?

n - 3

300

If an unknown number is n, what is double that unknown number?

2n

400

If an unknown number is n, what is 4 more than triple that unknown number?

3n + 4

500

If an unknown number is n, what is that number halved?

n/2

Collecting like terms (1)

100

Simplify: a + a + a

3a

200

Simplify: 5b + 2b

7b

300

Simplify: 10c - 3c

7c

400

Simplify: 8e + e - e

8e

500

Simplify: f + f - f + f - f - f

0

Collecting like terms (2)

100

Simplify: 5a + 2b + 3a + 2b

8a + 4b

200

Simplify: 9c + 10c + 4d + 3d

19c + 7d

300

Simplify: 4f + 8e + 2f + e

6f + 9e

400

Simplify: 4g + 3h - g - h

3g + 2h

500

Simplify: 8i + j + 3k + 2i - j + 4l

10i + 7l

Substitution (1)

100

if a = 2, b = 3 and c = 4

what is:

a + 9

11

200

if a = 2, b = 3 and c = 4

what is:

b + c - a

5

300

if a = 2, b = 3 and c = 4

what is:

4b

12

400

if a = 2, b = 3 and c = 4

what is:

abc

24

500

if a = 2, b = 3 and c = 4

what is:

2a + 3b + 4c

29

Substitution (2)

100

if x = 5, y = 6, and z = 7

what is:

x²

25

200

if x = 5, y = 6, and z = 7

what is:

xyz

210

300

if x = 5, y = 6, and z = 7

what is:

xy - z

23

400

if x = 5, y = 6, and z = 7

what is:

xyz - xyz

0

500

if x = 5, y = 6, and z = 7

what is:

z² - y2

13