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100

7x3=?

21

100

What are the factors of 3?

1 and 3

100

one over 7 

PLUS 

4 over 7

5 over 7

100

548+245= 

793

100

2 over 4

TIMES

2 over 4

4 over 16

200

6x5=?

30

200

What are the factors of 8?

1 and 8

2 and 4

200

2 over 9

PLUS

7 over 9

9 over 9

or 1

200

158+643= 

801

200

3 over 4

TIMES

2 over 3

6 over 12

300

12x3=?

36

300

What are the factors of 9?

1 and 9

3 and 3

300

120 over 200

PLUS

30 over 200

150 over 200

300

364+279= 

643

300

1 over 10

TIMES

6 over 10

6 over 100

400

8x4=?

32

400

What are the factors of 12?

1 and 12

2 and 6

3 and 4

400

6 over 10

PLUS

6 over 10

12 over 10

400

720+300= 

1,020

400

7 over 12

TIMES

7 over 12

49 over 144

500

9x9=?

81

500

What are the factors of 18?

1 and 18

2 and 9

3 and 6

500

74 over 100

PLUS

50 over 100

124 over 100

500

5,423 + 1,642 = 

7,065

500

8 over 11

TIMES

9 over 10

72 over 110