1. Double-sided use, addition and subtraction within 10 on the front side and within 20 on the back side. 2. Rounded corners, rounded and smooth without hurting your hands. 3. Thickened material, not easy to break 4. Clear printing, not easy to lose paint 5. Material: plastic 6. Size: about 25.5cm 7. Weight: about 48g
1. 双面使用，正面10以内加减法，反面20以内加减法 2. 圆弧边角，圆滑不伤手 3. 加厚材质，不易折断 4. 印刷清晰，不易掉漆 5. 材质：塑料 6. 尺寸：约25.5cm 7. 重量：约48g
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