A quick way to square numbers that end in 5 using the formula BY ONE MORE THAN THE ONE BEFORE.
- 752 = 5625
75
2 means 75 x 75.
The answer is in two parts: 56 and 25.
The last part is always
25.
The first part is the first number, 7, multiplied by the number "one more", which is 8:
so 7 x 8 =
56
- Similarly 852 = 7225 because 8 x 9 = 72.