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Subtraction with Borrowing

Regrouping shown the way it is written on paper — crossed out, with the new number above.

Start with · Subtract

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Grades 2–4

Addition with Carrying

Column addition with the carried digits written where they actually go.

Grades 3–5

Subtracting Across Zeros

When the neighbour is a zero it has nothing to lend, so you keep going left. The hardest one in the unit.

Grades 4–5

Adding Decimals

Line up the points, fill the gaps with zeros, then add like normal.

Grades 4–5

Subtracting Decimals

The same lining-up rule, plus borrowing across the decimal point.