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skip count
跳着数

dot paper
点纸

related
相关联的
multiplication
乘法

division
除法

Fact family
数字基本性质

missing
缺少的

act out
表 演
(biáo yǎn)
known
已知的
unknown
未知的

reverse operations
反运算

repeat
重复地

addition
加法

subtraction
减法

Group
组

equal
相等的

share
分享

even
相等的

remainder
余数

product
积

quotient
商
