If you wish to do this problem in your head - break the problem down. 45 multiplied by 45 -----------------------------------------
45 40 40 40 5
x45 is the same as -----> x40 + x 5 + x 5 + x 5
---- ----- ----- ----- -----
2,025 1600 + 200 + 200 + 25
------------------------------------------------------------------------------------------------------------------------------------------------------------
Another example:
23 20 20 40 5
x45 is the same as -----> x40 + x 5 + x 3 + x 3
---- ----- ----- ----- -----
1,035 800 + 100 + 120 + 15
------------------------------------------------------------------------------------------------------------------------------------------------------------
+37084 There IS a calculator on this site that would give you this answer very quickly and easily.....
45^2 = 45 x 45 =2025
If you wish to do this problem in your head - break the problem down. 45 multiplied by 45 -----------------------------------------
45 40 40 40 5
x45 is the same as -----> x40 + x 5 + x 5 + x 5
---- ----- ----- ----- -----
2,025 1600 + 200 + 200 + 25
------------------------------------------------------------------------------------------------------------------------------------------------------------
Another example:
23 20 20 40 5
x45 is the same as -----> x40 + x 5 + x 3 + x 3
---- ----- ----- ----- -----
1,035 800 + 100 + 120 + 15
------------------------------------------------------------------------------------------------------------------------------------------------------------
Here is a trick to multiplying numbers that end in 5(i. e., when squaring them): Eample: 45 x 45 =
1) First multiply the 4 by next higher digit, or 5 in this case: 4x5 =20. Then multiply 5 by itself as usual:
5x5 =25. And so the answer is:2025!. 75 x 75 =5625. or 95x95 =9025.....and so on.
