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Solve interesting Mathematics questions using tricks for students:   1. 20 * 20 = 400 2. 21 * 21 = 441 3. 22 * 22 = 484 4. 23 * 23 = 529 5. 24 * 24 = 576 6. 25 * 25 = 625 7. 26 * 26 = 676 8. 27 * 27 = 729 9. 28 * 28 = 784 10. 29 * 29 = 841  The answers of above is three digit number : Trick :- From above we can conclude that for example 20 * 20 for digit at unit place take last digit of 20 that is 0 take square of it  which is 0 for digit at tens place take again last digit of 20 then multiply last digit with 4 i.e. 0 * 4 = 0 for digit at hundreds place take digit at tens place from 20 i.e. 2 i.e. 2 take square of it  which is 4 So answer is 400 21 * 21 for digit at unit place take last digit of 21 that is 1 take square of it  which is 1 for digit at tens place take again last digit of 21 then multiply last digit with 4 i.e. 1 * 4 = 4 for digit at hundreds place take digit at tens place from 21 i.e. 2 i.e. 2 take square of it  which is 4 So answer is 441 ...

Solve Mathematics questions using tricks for students: 1. 10 * 10 = 100 2. 11 * 11 = 121 3. 12 * 12 = 144 4. 13 * 13 = 169 5. 14 * 14 = 196 6. 15 * 15 = 225 7. 16 * 16 = 256 8. 17 * 17 =  289 9. 18 * 18 = 324 10. 19 * 19 = 361  The answers of above is three digit number : Up-to 19 we can use, Trick :- From above we can conclude that for example 11 * 11 for digit at unit place take last digit of 11 that is 1 take square of it  which is 1 for digit at tens place take again last digit of 11 then add last digit i.e. 1+1 =2 and for digit at hundreds place take digit at tens place from 11 i.e. 1 So answer is 121 Similarly for 12 and 13. for numbers 14, 15, 16, 17, 18, 19: 17 * 17 for digit at unit place take last digit of 17 that is 7 take square of it  which is 49 form where carry 4 and consider only 9 for digit at tens place take again last digit of 17 then add last digit i.e. 7 + 7 = 14 add carry to it 14 + 4 = 18 from where carry 1 and consider only...