Fact 1:
1 = 1
1 + 3 = 4
1 + 3 + 5 = 9
1 + 3 + 5 + 7 = 16
1 + 3 + 5 + 7 + 9 = 25
See? The sum of odd consecutive numbers starting from 0, will always be a perfect square number no matter how far you go. Check it out!
Fact 2:
4% of 100 = 100 % of 4
6% of 38 = 38% of 6
5% of 10 = 10% of 5
7% of 50 = 50% of 7
Catch the drift?
Fact 3:
(a * b) * (c * d) = 100(ac) + 10(ad + bc) + (bd)
This is just the Rainbow Method simplified into an equation!
Fact 4:
To square 2 digit numbers ending with ‘5’ (Example: 75 × 75)
1. Take the first digit ‘7’ multiply by the number after ‘7’ => 7 × 8 = 56
1. Take the first digit ‘7’ multiply by the number after ‘7’ => 7 × 8 = 56
Now add 25 after the number. 56(25) = 5625
Hope you all enjoyed!
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