数的分与合

回忆20以内数的分与合（包括加法及相关的减法）。

Recall number bonds (addition and related subtraction facts) within 20

学习证据 / Evidence

• 能快速回忆起 8 + 5 = 13
• 面对 13 – 5，能利用相关的加法知识答出 8
• 知道所有和不超过20的两个一位数组合

• Quickly recall that 8 + 5 = 13
• Given 13 – 5, respond 8 using knowledge of related addition fact
• Know all pairs of single-digit numbers that sum to numbers up to 20

评估问题 / Assessment

{{name}}能快速回忆起像“8 + 7 = 15”这样的算式，并马上知道“15 − 7 = 8”，而不需要从头推算减法吗？

Can {{name}} quickly recall facts like '8 + 7 = 15' and immediately know that '15 − 7 = 8' — without having to work out the subtraction from scratch?