place value
integers
order of operations
roman/egyptian numbers
number patterns
100

value of the 7 in 

3 267 209

1 000

100

on a number line going from -10 to 10, where would the 0 sit

halfway

100

5x(3+2)

25

100

III in english

3

100

2,_,8,16,_,64

2,4,8,16,32,64

doubling

200

XII in english

7

300

_,9,16,23,_,37

2,9,16,23,30,37

going up by 7

500

1,_,2,3,5,8,_,21

1,1,2,3,5,8,13,21