### October 1, 2007

Today in class, we started off with mental math, like we usually do. After correcting eachothers papers, Mr. Kuropatwa taught us a new trick: **Multiplying "Teens"**. For example: **17 x 15**. You take any of the two numbers and add it with the ones digit of the other number, like **17** and **5**. You then take the sum of the two numbers, which is **22**, and mulitply it by **10**. You get **220**. You take the ones digit of both **17** and **15** and multiply it together to get **35**. After that, you add **220** and **35** to get your final answer, which is **255**. We also did some questions on the smartboard and you should always show your work step by step.

The next scribe will be.. Jonathan.

## 6 comments:

The questions on the smartboard was figuring out your gross pay remember. Here are the steps

Step 1

Determine the overtime hours

Step 2

Overtime pay = (wage)(Overtime hours)(overtime rate)

Step 3

Regular hours = {wage)(regular hours)

Step 4

Add the overtime pay and regular hours

And that will give you your answer

:) i hope that will help anyone with any problems

Hi Tina,

What a great new strategy for "multiplying teens"!

And Joyce, thanks so much for adding the steps for determining gross pay! I'm sure you helped your classmates with their learning!

Best Wishes,

Lani

Wow that was really a nice idea...It was really a new strategy for multiplying tens!!!!

cheers,

Rosy.

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http://www.esumz.com

This is a very good way to multiply

"teens" but is very important to write down every step because mistakes can easily be made. It is also a good idea to write down steps for any math problem because, even if you don't get the correct answer, partial marks are still possible. I hope everyone uses the tricks you learn in class because it will make school a lot easier!

Tara S. (Mentor)

University of Regina

That is a great way to break down multiplying teens! I always try to find easier "tricks" to working out tough math problems. It makes mental math less "mental"! Keep up the good work!

Jenelle, K (mentor)

University of Regina

Thats a great technique. So much quicker and easier.

I might teach that to my elementary kids one day.

Thanks for the maths tips.

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