Lesson # 13 Squaring 5’s A neat shortcut… For multiplying

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Presentation transcript:

Lesson # 13 Squaring 5’s A neat shortcut… For multiplying Numbers that end With a 5, Like 15, 25 , 35, 45…

In your head Fairly Quickly, Hopefully, Hongbin!

Look at the first digit “1”. Here is how it works… Lets look at 15 x 15 It equals ? Look at the first digit “1”. Then, think of the very next digit, after a one…

It is a 2, right… Then what you do Is multiply the 1 and the 2, together, THEN Put a “25” at the end of your answer. Watch…

15 x 15 = 1 x 2 = 2 Then stick on the 25… 225 Is the answer! Trust me.

Another example… 95 x 95 = ? 9 x 10 = 90 Then stick on the 25 9025

Remember… All answers End With A 25 !

Now get ready to try 10 Practice Questions Ready ?

Set ? Go !

Question # 1 85 x 85 =

Question # 2 25 x 25 =

Question # 3 75 x 75 =

Question # 4 35 x 35 =

Question # 5 65 x 65 =

Question # 6 15 x 15 =

Question # 7 55 x 55 =

Question # 8 45 x 45 =

Question # 9 95 x 95 =

Question # 10 1.5 x 1.5 =

And now… get ready To correct Your Answers !

Question # 1 85 x 85 = 7225

Question # 2 25 x 25 = 625

Question # 3 75 x 75 = 5625

Question # 4 35 x 35 = 1225

Question # 5 65 x 65 = 4225

Question # 6 15 x15 = 225

Question # 7 55 x 55 = 3025

Question # 8 45 x 45 = 2025

Question # 9 95 x 95 = 9025

Question # 10 1.5 x 1.5 = 2.25

The End

Did I mention… Practice, practice, practice, practice, practice, Practice, practice, practice, practice, practice Practice, practice, practice, practice, practice Practice, practice, practice, practice, practice Practice, practice, practice, practice, practice Practice, practice, practice, practice, Practice, practice, practice, practice, practice practice ?