We love Zeros!
Facts
Doubles
1 digit
2 digits
100

9 X 10

90

100

6 x 3

18

100

3 x 3 

9

100

23 X 2

46

100

26 X 12

312

200

7 X 100

700

200

4 x 7

28

200
5 x 5

25

200

85 X 3?

255

200

85 X 35

2,975

300

6 X 700

4,200

300

9 x 3

27

300

7 x 7

49

300

239 X 7

1,673

300

145 X 39

5,655

400

47 X 1,000

47,000

400

8 x 7

56

400

8 x 8

64

400

291 X 8

2,328

400

80 x 64

5,120

500

3 X 2,500

What is 7,500

500

7 x 6 

42

500

9 x 9

81

500

2,402 X 3

7,206

500

1,407 X 27

37,989