addition
subtraction
geometry
multiplication
more addition
100

1+1=

2

100

2-1=

1

100

a four sided figure with four right angles.

square or rectangle or quadrilateral

100

1x1

1

100

2+2=

4

200

10+10=

20

200

20-20=

0

200

an angle less than 90o

acute angle

200

10x10

100

200

20+20=

40

300

134+27

161

300

100-120=

-20

300

an angle over 90but less than 180o

obtuse angle

300

12x12

300

200+200=

400

400

1000+957=

1957

400

1-100=

-99

400

a triangle with a right angle

right triangle

400

100 x 10

1000

400

2024+2024=

4048

500

100000+123456=

223456

500

100000-1000000=

-1000

500

a triangle with two congruent sides

iososeles triangle

500

1000 x 1000=

1000000

500

100000+100000

200000