Addition & Subtraction · 加减法练习 — column-form addition and subtraction drills from within 10 up to 10,000 with optional regrouping, fact tables and printable worksheets / 10 至 10000 以内竖式加减法练习，可选进位退位，附加法减法速查表与可打印题集

melody.games
1/10

关于「加减法练习」 · About Addition & Subtraction

大数加减法的竖式练习：选好运算、进退位和数域，从个位往上填答案，答对一题点亮一个进度点；速查表能查 20 以内加减法，打印题集一键生成 50 题练习卷。

Column-form practice for bigger numbers: pick the operation, regrouping and range, fill the answer from the ones up, and light up a dot for every win; the fact tables cover sums and differences within 20, and one tap prints a 50-problem worksheet.