Math: Multiplication fun fact

Perfect Squares of two digit numbers that end with 5 Step 1 - multiply the first digit by the next consecutive integer Step 2 - place 25 at the end of your result Lets try an example 15 x15 = ? Step 1 - the first digit is 1 the next consecutive integer after 1 is 2 1 x 2 = 2 Step 2 - place 25 at the end of 2 this is 225 15 x 15 = 225 Next example 25 x 25= ? step 1 - 2X3 = 6 step 2 - 625 25 x 25 = 625 Final example 35 x 35=? step 1 - 3 x 4 = 12 step 2 - 1225 35 x 45 = 1225

Practice these on your own, and verify with the use of a calculator

45 x 45 =

55 x 55 =

65 x 65 =

75 x 75 =

85 x 85 =

95 x 95 =