What this lesson shows
(8 × n) + 155 = 315: take away 155, then divide by 8. n = 20.
The worked example
The lesson works this one step by step: 8 × n + 155 = 315. Then your kid tries one like it on paper.
The steps
- Steps done to n
- Undo in reverse
- Check
Helping at home
Read the equation as steps done to n: times a number, then plus a number. Undo them in the opposite order: subtract first, then divide. Check by putting n back in.
If your kid gets stuck
Undo the last step first.
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.