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课程 1 · 年级 1–2
Adding and subtracting
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
Adding means putting groups together: 3 apples + 2 apples = 5. Subtracting means taking away: 5 − 2 = 3.
💡 Trick: think in tens! 8 + 7 = 8 + 2 + 5 = 15. First make ten, then add the rest.
- ●3 + 4 = 7
- ●9 − 5 = 4
- ●12 + 8 = 20