add it up!
what number?
subtractions action
how many? how much?
what comes next?
100

5 + 3

8

100

326

Three hundred twenty six

100

15 - 6

9

100

EEEEE

EEEEE

EEEEE

EEEEE

4 groups with 5 items in each

100

ABABABABA  ____  _____  _____

BAB

200

15+2

17

200

1,282

One thousand, two hundred, eighty two

200

27 -12

15

200

xo         xo

xo         xo

xo         xo

xo

xo

8 groups with 2 items in each

200

ABabABabABabA ___ ____ ____

Bab

300

17 + 6

23

300

5,798

five thousand, seven hundred ninety eight

300

97 - 32

65

300

$$$

$$$

$$$

3 groups with 3 items in each

300

OOxOOxOOxO ___  _____

Ox

400

32 + 48

80

400

12, 341

Twelve thousand, three hundred, forty-one

400

125 - 30

95

400

******

******

******

******

******

5 groups with 6 items in each

400

12332112332112___ ____ ____

332

500

127 + 35

162

500

324,998

Three hundred twenty four thousand, nine hundred ninety eight

500

428 - 49

379

500

###

###

###

###

4 groups with 3 items in each

500

1bx1bx1bx1 ___ ___ ___

bx1