Squares and Square Roots ADV Perfect Squares and their Square Roots 1 - 25 and beyond Tools A B 1 1 2 4 3 9 4 16 5 25 6 36 7 49 8 64 9 81 10 100 11 121 12 144 13 169 14 196 15 225 16 256 17 289 18 324 19 361 20 400 21 441 22 484 23 529 24 576 25 625 30 900 40 1600 50 2500 60 3600 70 4900 80 6400 90 8100 100 10000 110 12100 120 14400 130 16900 140 19600 150 22500 160 25600 170 28900 180 32400 190 36100 200 40000