What this lesson shows
Fixes a mistake
16 + 37 = □ + 38. 38 is one more than 37, so the box is one less than 16: 15, not 17.
The worked example
The lesson works this one step by step: 16 + 37 = □ + 38. Then your kid tries one like it on paper.
The steps
- Compare the number by the box with its partner
- 1 more there means 1 less in the box
- Find the box
- Check that both sides match
Helping at home
Compare the number beside the box with its partner on the other side. If it is more, the box is less by the same amount. If it is less, the box is more. Check by adding both sides.
If your kid gets stuck
More on one side, less in the box.
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.