Doubling and halving
A number talk
Watch the video to see what to do
Transcript
OK, everybody, welcome back! We're here today to have a look at the game multiplication toss, which some people also call how close to 100. To play today I'm using a spinner, and I just made it by printing out a decagon and drawing lines across the opposite angles and labeling it from 0 to 9.
And I'm going to use my paper clip that I found in the drawer, and a pen and I can flick it...
Transcript coming soon.
Collect resources
You will need:
Items to create a mathematical model
pens or pencils
scissors
plain paper, grid paper or dot paper.
Discussion
Create a mathematical model to show how you could use doubling and halving to solve 6 x 8. You could use grid paper, dot paper, or even draw a comic strip!
Find 3 examples where doubling and halving isn't an efficient strategy. Why is it more efficient for some problems and not for others?