##### Multiplication. It is one of the four types of operations you learned in math (along with addition subtraction and division). There are many different ways to multiply numbers. However, sometimes, multiplying really big numbers can be a challenge. Luckily, there are many different techniques you can use to solve large multiplication problems.

##### Spark your math thinking!

- Set up your math mini spark recording page: #54: Multiplication Tricks
- Watch this video about multiplying using lines. Take some notes as you watch to track the process.
- Print out (or have your teacher print out) this worksheet. Use the method in the video to come up with answers to multiplication problems. You can check your answers on the second page of the worksheet. If you feel comfortable with those problems and want to try multiplying bigger numbers, then print out this worksheet.
- Check out a second math trick. Watch this video for a way to check the answers to your multiplication problems you solved in the worksheets.
- Use the app Explain EDU to do two sample problems.
- Share your math mini spark recording page and Explain EDU project with your teacher/EY coordinator.

*Lesson inspired by multiplication lessons from East Asian schools

Wow! That’s a really cool method. I see how it works. It’s really interesting.

I learned that by drawing intersecting lines, you can multiply numbers. Also, I went on to the zeros and larger numbers video and learned that too!

I learned how to multiply using lines and it is really cool.

I never thought there would be an easier way to do this multiplication, but I learned you can use intersecting lines. It’s really cool! I also watched the video about using bigger numbers and ones with 0 in the digits. I might actually start using this instead of regular multiplication.

I learned that you can use lines to multiply numbers. It was super simple and I think I will use this trick to do many multiplication problems.

I learned all about X and Y.

15×13 is 195. I’ll send a picture to Mrs. Spady!

I tried using the method to find 14*12. My answer was 168. I thought this method was really cool to use. I had never seen this before then I watched Abby do it one day and I thought it was a really interesting method to use when multiplying. (Just to make sure I did the actual multiplication and got the same answer.)

I never knew that was possible. Fascinating!

The multiplying lines and the casting out nines tricks are quick and easy ways to do and check math.

I learned about the Fibonacci Sequence. This a series of numbers that has a very unique pattern to it. To find the next number in the pattern, you just have to add the two numbers behind the unknown number. For example, 0,1,1,2,3,5,n. To find n, just add the two numbers behind it. So 5+3=8 therefore n=8.

Cool Facts I learned

•This is nature’s numbering system

•It is named after a mathmetician

•It was known by people in India along time ago