Show:
Addition
Subtraction
Adding Units
Subtracting Units
100

10+10

20

100

20-20

0
100

1 ten + 2 tens = ___ tens

3 tens

100

3 tens - 1 ten = ____ tens

2 tens
200

20+30

50

200

40-30

10

200

4 tens + 1 ten = ___ tens

5 tens

200

5 tens - 3 tens = ____ tens

2 tens

300

40+20

60

300

50-20

30

300

3 tens + 4 tens = ___ tens

7 tens

300

6 tens - 2 tens = ____ tens

4 tens

400

50+30

80


400

70-50

20

400

4 tens + 5 tens = ___ tens

9 tens
400

 7 tens - 6 tens = ____ tens

1 ten

500

60+40

100
500

90-40

50
500

8 tens + 2 tens =

10 tens/1 hundred

500

 9 tens - 5 tens = ____ tens

4 tens