This week we'll be multiplying a 3-digit number by a 1-digit number using expanded form. If you remember, we did a little bit of this using mental math. Don't forget to round numbers to find an estimate to check if your answer is reasonable.
For example:
739 x 6
Estimate first: 700 x 6 = 4200
Because we rounded 739 down, our actual product will be higher than 4200.
739 = 700 + 30 + 9
We are going to multiply each of those numbers by 6 and then add all the products.
700 x 6 = 4200
30 x 6 = 180
9 x 6 = + 54
4434
4434 is more than 4200 so our answer is reasonable.
Try the examples below. I think you should be able to complete the questions without using base-ten blocks.
In the spirit of the Blue Jays quest for a play-off spot, here's a link to a beautiful baseball story.
What do you think is the message? Kevin Costner gives you a lot of hints!
http://www.storylineonline.net/catching-the-moon-the-story-of-a-young-girls-baseball-dream/
