Addition & Subtraction within 10000
Line up the places, start from the ones: carry a ten, or borrow one ten for ten ones
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Line up the places, start from the ones: carry a ten, or borrow one ten for ten ones
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Three-digit sums still come down to two rules: ten ones carry into the tens, and a short ones column borrows one ten as ten ones. The vertical form unfolds step by step — carries show up as a small red 1 above the next column, borrows as a red dot and a small adjusted digit. Every puzzle guarantees a carry or a borrow, so you practise exactly the tricky parts.
Watch a three-digit vertical sum unfold step by step: line up the places first, then start from the ones. When the ones overflow, a small red 1 appears above the tens; when the ones fall short, the tens digit is marked with a borrow dot and a small adjusted digit. Tap "Next step" and walk through every stage yourself.