Do you know the box method? When I first moved up to fourth grade I thought...wow, double digit multiplication is hard! How am I ever going to teach it in a "non-traditional" way that makes sense to my students?
Luckily, I work with an amazing math specialist as well as hardworking team who introduced me to the "box" method. What is that you ask? Well, I think the strategy has many different names...but this is the way that we teach it.
Take a double or triple digit number and break it into place value parts. 327 x 15 = ?
300 + 20 + 7
10 + 5
Then put them on this grid...
X
300 20
7
Then you add up the columns so that 3000 + 1500= 4500, 200 + 100 = 300 and 70 + 35 = 105
Next add the 4500 + 300 + 105 = 4,905.
Luckily, I work with an amazing math specialist as well as hardworking team who introduced me to the "box" method. What is that you ask? Well, I think the strategy has many different names...but this is the way that we teach it.
Take a double or triple digit number and break it into place value parts. 327 x 15 = ?
300 + 20 + 7
10 + 5
Then put them on this grid...
3000
|
200
|
70
|
1500
|
100
|
35
|
10
5
To explain this to my kids, I created a power point. It is your FREE to download at TeachersPayTeachers by clicking the link right here!
I hope you enjoy this new product!
Hi Leslie! We love using this method for multiplying! I like how you call it the "box" method...much more catchy than what we thought of, which is not original...Partial Product Grids! Great post!
ReplyDeleteAndrea
One Teacher's Take