1.OA.B.4
Subtraction as a missing addend
Understand subtraction as finding an unknown addend, like solving 10 − 8 by asking 8 + ? = 10.
Cấp lớp: Lớp 1 · Lãnh địa: Các phép tính và tư duy đại số
Trò chơi phù hợp với 1.OA.B.4
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