大数的认识 (Understanding Large Numbers)
亿以内数的认识 (Understanding numbers within a hundred million)
计数单位和数位 (Counting units and number places)
相邻计数单位间的进率 (Rate of progression between adjacent counting units)
读写大数 (Reading and Writing Large Numbers)
亿以内数的读法 (Reading numbers within a hundred million)
亿以内数的写法 (Writing numbers within a hundred million)
生活中的大数 (Large numbers in daily life)
比较大数的大小 (Comparing Large Numbers)
位数不同时 (When number of digits are different)
位数相同时 (When number of digits are the same)
近似数 (Approximate Numbers)
用“万”或“亿”作单位改写数 (Rewriting numbers using "ten thousand" or "hundred million" as units)
“四舍五入”法求近似数 (Rounding using "rounding to the nearest five" method)
计算工具的认识 (Understanding Calculation Tools)
数的产生 (Origin of numbers - historical overview)
算盘 (Abacus)
计算器 (Calculator). 上述内容给4年级中国小孩进行预习，请用适合这个年纪的男孩表达方式，诙谐的语气和动画展示