Today in maths we learned a new subtraction strategy using an analogy about a policeman and a robber. This strategy helps us to subtract numbers by making the number we are taking away into a tidy number. Then we also need to change the other number the same way... watch this great video to see what to do. Once you are finished try the problem below.
There are 54 apples in the fruit box.
We eat 27 at morning tea.
How many are leftover?
Even my stage 6, early 7 learners enjoyed using this strategy as a smarter one than the partitioning they had previously. I ran this lesson because I noticed it was a gap in their learning, and was overwhelmed with joy at how engaging it was for them all.
The replay-ability of this tool was great. Some of the learners chose to come and work with me in a workshop going over the strategy again, while others just chose to re-watch the video to get the hang of it.
Other digital tools I use in my class include XTRAmath.org which runs basic facts drills and IXLmath which has practice drills (free for 5 minutes per day). Let me know if you have other great digital math resources.