Triangles

Math Facts

100

All of the angles in a triangle add up to be...

180 degrees!

200

A square (a door)  inside the triangle equals 

90 degrees

300

A letter in place of an amount you don't know is a...

Variable

400

When you do something to one side you must...

Do it to the other!

500

The opposite of minus is

addition!

Level 1

100

Solve: 

30+50+(x+7)=180

x=93

200

Solve

80+50+(x+3)=180

x=47

300

Solve 

30+90+(x-7)=180

x=67

400

Solve 

50+50+(x-9)=180

x=89

500

Solve

20+20+(x+5)=180

x=135

Level 2

100

Solve

36+59+(x+7)=180

x=78

200

Solve

76+69+(x+ 2)=180

x=33

300

Solve

86+57+(x-7)=180

x=44

400

Solve

75+42+(x-3)=180

x=66

500

Solve

12+99+(x+7)=180

x=62

Level 3

100

Solve

36.7+59.5+(x+7)=180

x=76.8

200

Solve

64.9+34.6+(x+5)=180

x=75.5

300

Solve

32.7+88.8+(x-5)=180

x=63.5

400

Solve

77.5+23.9+(x+10)=180

x=68.6

500

Solve

36.7+59.9+(x-6)=180

x=89.4