I think I get it now! Using the poster's example

3453
-1259
__________

It's not immediately obvious you need to trade in the 100s column b/c there are 5s in the tens column. But, in that lesson, it mentions letting the child discover the following method: that 59 is more than 53. Looking at it that way, it's obvious you need to trade in the 100s place.

Is that right?

Hello Captuhura,

That is correct!
That is one of several ways you can see that you need to trade, but that is by far the easiest way to see it, well that's my opinion.

Thank you for giving your child a RightStart in Math,

Carissa
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