To square 2 digit numbers ending with eg 75 × 75 ‘5’ 1. The answer will end with ‘25’ 2. Take the first digit multiply by the number after => 7 × 8 = 56 ‘7’ ‘7’ 75 × 75 = 5625 Test it out with 95 × 95. Did you get 8125? Squaring any number take any number and find out how much to add to get it to the nearest tens subract and add that number to the orignal number multiply add the square example: (999+1) (999-1) + (1^2) (998) (1000) + 1 999^2 + 998001 Squaring a number A math trick I noticed when I was young. If you are squaring a number it is always equal to the total of the number times 2 subtract one of the previous squared number. This is helpful if you dont want to write it out. For instance most people know that 10×10=100 or 11×11=121 even 12×12=144 so let’s say you don’t know 13×13. Its equal to (13×2)-1(plus the previous squared number which was 12×12)144=169 Squaring two digit numbers Suppose AB is the number, Then arrange the number as follows, A*A|2*A*B|B*B ( if A*A or A*B is one digit add 0 prior to that eg: 4 should be written as 04, 5 should be 05 – etc..) Take a number : 35 09|30|25 ( 3*3 | double of 3*5 | 5*5 ) From right to left, keep the right most number as it is and add the number coming both side of | symbol.
To square 2 digit numbers ending with ‘5’ eg 75 × 75 1. The answer will end with ‘25’ 2. Take the first digit ‘7’ multiply by the number after ‘7’ => 7 × 8 = 56 75 × 75 = 5625 Test it out with 95 × 95. Did you get 8125? Squaring any number take any number and find out how much to add to get it to the nearest tens subract and add that number to the orignal number multiply add the square example: (999+1) (999-1) + (1^2) (998) (1000) + 1 999^2 + 998001 Squaring a number A math trick I noticed when I was young. If you are squaring a number it is always equal to the total of the number times 2 subtract one of the previous squared number. This is helpful if you dont want to write it out. For instance most people know that 10×10=100 or 11×11=121 even 12×12=144 so let’s say you don’t know 13×13. Its equal to (13×2)-1(plus the previous squared number which was 12×12)144=169 Squaring two digit numbers Suppose AB is the number, Then arrange the number as follows, A*A|2*A*B|B*B ( if A*A or A*B is one digit add 0 prior to that – eg: 4 should be written as 04, 5 should be 05 etc..) Take a number : 35 09|30|25 ( 3*3 | double of 3*5 | 5*5 ) From right to left, keep the right most number as it is and add the number coming both side of | symbol.