Add
Subtract
Missing Letter
100

2+1=

3

100

10-5=

5

100

Whats the missing letter for the vocabulary word 

me_er?

t ! Meter.

200

3+3=

6

200

6-4=

2

200

Whats the missing letter for the vocabulary word,

are_?

a! Area.

300

6+1=

7

300

8-1=

7

400

11+3=

14