What this lesson shows
87 − 35 = 80 − 29 is false. One side is 52 and the other is 51.
The worked example
The lesson works this one step by step: 87 − 35 = 80 − 29. Then your kid tries one like it on paper.
The steps
- Work out the left side
- Work out the right side
- The same: true
- Not the same: false
Helping at home
Work out the left side under it: take away the tens, then the ones. Do the same for the right side. The same: true. Not the same: false.
If your kid gets stuck
Take away the tens, then the ones.
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.