What is 21 squared x 33 sqared times 66 squared?

Answer 1

2,091,964,644

How to work fast (without calculator)

212* 332 * 662 = (21*33*66)2 = 457382

21*33 = 693 (easy)

693*66 = 45738

693*

066

6*3 = 18

1 + 6*3 + 9*6 = 73

7 + 6*9 + 6*6 + 0*3 = 97

9 + 6*6 + 0*9 = 45

4 + 0*6 = 4

457382 = 4252723282 = 1625490964

101*2(3*8) = 480

102*2(7*8) = 11200

103*2(7*3) = 42000

103*2(5*8) = 80000

104*2(5*3) = 300000

105*2(5*7) = 7000000

104*2(4*8) = 640000

105*2(4*3) = 2400000

106*2(4*7) = 56000000

107*2(4*5) = 400000000

1625490964+ = 2091964644

0000000480

0000011200

0000042000

0000080000

0000300000

0007000000

0000640000

0002400000

0056000000

0400000000