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官方数学课
互动练习,免费开放,无需登录或积分

一年级 · 加法
Adding with 8, 7, and 6
Make-ten practice for adding onto 8, 7, and 6.

一年级 · 加法
Adding with 9
A make-ten adventure for adding onto 9.

一年级 · 加法
Make-Ten Helper
Step-by-step make-ten tool for classroom demos.

一年级 · 计数
How Many In Between?
Three ways to count how many people stand between two others.

一年级 · 数的认识
Numbers 11–20
Tens and ones with sticks and a place-value counter.

一年级 · 数序
Order and Size: 0–20
Ordering, neighbors, number-line comparison, and matching.

二年级 · 乘法
Math Artillery Academy
Aim shells on a number line to see what multiplication means.

二年级 · 乘法口诀
Multiplication Bubble Blast
Shoot number bubbles and clear multiplication triplets.

四年级 · 除法
Long Division Lab
Leveled practice: fact families, long division, and decimals.