在這個部分會學到:
See how the number system was invented and how it works.
數字系統如何被發明以及它如何運作
Identify four important sets of numbers: counting numbers, integers, rational numbers, and real numbers.
辨認四個重要的數字集合:自然數、整數、有理數以及實數
Use place value to write numbers of any size.
使用位值寫下任何大小的數字
Round numbers to make calculating quicker.
使用概數讓計算更迅速
Work with the Big Four operations: adding, subtracting, multiplying, and dividing.
使用四大運算:加、減、乘以及除