What this lesson shows
Fixes a mistake
After opening a ten in 32 − 8, 2 tens are left, not 3. 24, not 34.
The worked example
The lesson works this one step by step: 41 − 6 = □. Then your kid tries one like it on paper.
The steps
- Open a ten
- Cross out the opened rod
- Count the tens left
Helping at home
After trading a ten for 10 ones, cross out the rod. Count only the tens still standing, then the ones left.
If your kid gets stuck
How many tens are still there?
Watch it with Lux
With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.