a half dozen
半打

I'll give you half.
我会给你一半。

My nephew knows how to count to ten.
我的外甥知道怎么数到十。

What's the sum?

/

What's the total?

总共是多少？

Subtraction

10 - 4 = 6

Subtracting 4 from 10 gives you 6.
10减4等于6。

Addition

5 + 7 = 12

Adding 5 to 7 gives you 12.
5加7等于12。

Multiplication

3 × 6 = 18

Multiplying 3 by 6 is 18.
3乘以6等于18。

Division

remainder

余数

32 ÷ 8 = 4

Dividing 32 by 8 gives you 4.
32除以8等于4。