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Perfect Squares
Missing Base
100

-6+9

3

100

10-14 

-4

100

(−3)(5)

-15

100

62

36

100

□2  =64

8

200

13+(-8)

5

200

−7−5

-12

200

(−8)(−4)

32

200

112

121

200

□ 2=  121

11

300

-15+7

8

300

12−(−6)

18

300

7 (-9)

-63

300

142

196

300

□2=  256

16

400

28+(-35)

-7

400

−18−(−9)

-9

400

(−12)(6)

-72

400

172

289

400

□2=  441

21

500

−22+(−19)

-41

500

−30−17

-47

500

(−15)(−7)

105

500

232

529

500

□2= 784

28