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Mental Math
Definitions
True or False
Algebra
Triangles
100

250 + 325 = ?

575

100

What does 'SSS' stand for?

Side Side Side

100
Complementary angles add up to 90 degrees

True

100

2(10 + x) = 100

x = 40

100

How many sides does a triangle have?

3

200

45 + 32 = ?

77

200

Two (or more) angles whose sum is 180 degrees

a. Supplementary angles

b. Complementary angles

c. Descriptive angles

Supplementary angles

200

Supplementary angles add up to 190 degrees

False. They add up to 180 degrees.

200

2(n + 5) = -2

n = -6

200

How many degrees are in a triangle?

a. 90

b. 180

c. 360

180 degrees

300

127 + 154 = ?

281

300

The point that divides the segment into 2 congruent segments

a. Divider

b. Midpoint

c. Angle

Midpoint

300

Parallel lines form a 90 degree angle.

False.  

300

-12(x + 5) = 144

x = 17

300

True or False?

  • A triangle has three sides, three angles, and three vertices.

True

400

1,225 + 370 = ?

1,595

400

A point, ray, line, line segment, or plane that intersects the segment at its midpoint.

a. segment bisector

b. slope

c. intercept

Segment bisector

400

The reflexive property tells you that a line is congruent to itself.

True.

400

2x + 3= 5x - 24

x = 9

400

How many degrees are in a right angle?

a. 90

b. 180

c. 360

90 degrees

500

1,575 + 220 = ?

1,795

500

Has 2 dimensions, represented by a shape that looks like a floor or a wall, but extends without end.

a. line

b. plane

c. point

Plane

500

The midpoint formula uses 2 points to solve.

True.

500

4y - 3 = 2y + 15

x = 9

500

Name the measurement of 1 angle in an equilateral triangle.

a. 60 

b. 5

c. 10

60 degrees