Lesson # 4 The “Teens” Times Table People might say… Hey… This is a “teen” Lesson, intended for “teens”, That’s pretty Keen, If you know what I mean,

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Presentation transcript:

Lesson # 4 The “Teens” Times Table

People might say… Hey… This is a “teen” Lesson, intended for “teens”, That’s pretty Keen, If you know what I mean, Jellybean

This is a super fast way… To multiply “teens” In your Head !

For example… Try 15 x 16 = ?

Hard to do ? Try these four steps…

Step # 1(15x16) Add one teens number to the ones digit of the other. Add = 21

Step # 2 (15x16) Multiply that sum by x 10 = 210

Step # 3 (15x16) Multiply the two digits in the “ones” place. 5 x 6 = 30

Step # 4 (15x16) Add that (30) to your other answer (210) = 240

Check with a calculator 15x16 = 240

Here are the four steps again… #1) Add one teens number to the ones digit of the other. #2) Multiply that sum by 10. #3) Multiply the ones digits. #4) Add this to your answer.

Try this in your head (17 x 13) Think… Step # 1) Add one teens number to the ones digit of the other = 20 Step # 2) Multiply that sum by x 10 = 200 Step # 3) Multiply the ones digits. 7 x 3 = 21 Step # 4) Add them = 221

This takes lots of practice so … Let’s do one more example…

Try this one ( 14 x 19) = ?

Think (14 x 19 ) = ? #1) = 23 #2) 23 x 10 = 230 # 3) 4 x9 = 36 #4) = 266

Did you get it right? If you did, you are ready to try some more. Get ready for 10 practice questions…

Remember to write down only the answer. Good Luck !

Question # 1 11 x 19 = ?

Question # 2 12 x 18 = ?

Question # 3 17 x 16 = ?

Question # 4 19 x 13 = ?

Question # 5 15 x 16 = ?

Question # 6 14 x 14 = ?

Question # 7 19 x 18 = ?

Question # 8 17 x 17 = ?

Question # 9 18 x 18 = ?

Question # x 18 = ?

Now get ready to correct your answers !

The answers are on the way! Hope you are ready !

Question # 1 11 x 19 = 209

Question # 2 12 x 18 = 216

Question # 3 17 x 16 = 272

Question # 4 19 x 13 = 247

Question # 5 15 x 16 = 240

Question # 6 14 x 14 = 196

Question # 7 19 x 18 = 342

Question # 8 17 x 17 = 289

Question # 9 18 x 18 = 324

Question # x 18 = 270

The End