Show:
addition
subtraction
doubles
comparing
place value
100

20+20

40

100

40-20

20

100

5+5

10

100

959_123

959>123

100

198

HUNDREDS

200

40+40

80

200

90-70

20

200

8+8

16

200

70_50

70>50

200

1754

THOUSAND

300

40+60

100

300

600-300

300

300

9+9

18

300

900<1000

less than

300

7891

TENS

400

40+90

130

400

100-18

82

400

70+70

140

400

600_70

600>70

400

6981

ONES

500

50+7000

7050

500

900-60

840

500

90+90

180

500

900_600

900>600

500

7985

TENS