The digit rule · the shortcut
367 + 258 = 625 Grade 3
How this one works
How
look at the digit just to the right, then round up or down.
Best when
you already know why it works and want to go fast.
The same problem, other ways
Try “number line” or “4.5D”
367 + 258 = 625 Grade 3
How this one works
look at the digit just to the right, then round up or down.
you already know why it works and want to go fast.
The same problem, other ways