Addition and subtraction up to 1000 — split by place value, bridging a decade, compensation, and constant difference, revealed as number-line jumps and base-ten pieces.
Open toolSkip counting to equal groups, using tens and fives, doubling, and the distributive property — every strategy shown as an array, never a bare fact.
Coming soonThink-multiplication and partial-quotients strategies built on the inverse relationship with multiplication, not treated as a brand-new operation.
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