Show:
Repeated addition
Equal Groups
Addition
Multiplication
100

7+7+7+7=

28

100

4 groups of 4=

16

100

15+20=

35
100

4x3=

12

200
6+6+6=

18

200

7 groups of 3=

21
200

16+16=

32

200

7x4=

28

300

8+8+8+8+8+8=

48

300

12 groups of 2=

24

300

33+7=

40

300

9x2=

18

400

12+12+12=

36

400

5 groups of 9=

45

400

17+20

37

400

21+6=

27

500

9+9+9+9=

36

500

7 groups of 9=

63

500

20+21=

41

500

71+3=

74