addition - 加法, add/plus - 加, plus sign - 加号, addend - 加数, sum - 和, altogether - 一共, subtraction - 减法, minus - 减, subtract - 减, minuend - 被减数, subtrahend - 减数, difference - 差, one-digit number - 一位数, two-digit number - 两位数, place value - 位值, ones place - 个位, tens place - 十位, adjacent number - 相邻数, tens number - 整十数, column method - 竖式, without regrouping - 不进位/不退位, regrouping - 进位/退位,

G2 U1 Addition and Subtraction within 100

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