Show:
2 addend addition
3 addend addition
fact families
subtraction
doubles facts
100

 9+12

What is 21

100

3+2+5

What is 10

100

3,5,8

3+5=8

5+3=8

8-3=8

8-5=8

100

9-6

what is 3

100

4+4

What is 8

200

16+9

What is 25

200

5+7+7

what is 19

200

6,10,4

6+4=10

4+6=10

10-6=4

10-4=6

200

10-6

What is 4

200

9+9

What is 18

300

11+8

what is 19

300

9+9+4

what is 21

300

5,15,10

5+10=15

10+5=15

15-5=10

15-10=5

300

25-12

what is 13

300

11+11

What is 22

400

20+25

What is 45

400

10+50+10

What is 70

400

20,9,11

9+11=20

11+9=20

20-9+11

20-11+9

400

30-17

What is 13

400

25+25

What is 50

500

120+40

What is 160

500

60+90+60

what is 210

500

100,70,30

70+30=100

30+70=100

100-70=30

100-30=70

500

120-60

What is 60

500

70+70

What is 140