賴昱錡
討厭程式的小廢物
Decimal
十進位
Self Introduction
- My name is Yu-Chi Lai (阿錡)
- I'm from Keelung, Taiwan.
- Studying Computer Science at NTU (臺灣大學)
- I like playing Rubiks' Cube (魔術方塊), reading manga, writing computer programs.
Your turn
輪到妳啦!
Do you like math?
Whether your answer is yes or no, tell me the reason.
(Any answers are accepted~)
If you master math, you can live a easier life and explore what you really love.
- What does the word "decimal" mean?
- \(3+4\) 怎麼算？
- \(2+8\) 怎麼算？
- \(8+9\) 怎麼算？
- \(7-2=?\)
- \(16-9=?\)
- \(27-9=?\)
- 你擅長進位與借位嗎?
Quick Review~
Quick Review~
Carry ＆ borrow
進位與借位
How about explain the two terms (專有名詞) given above in your own way?
Process
需不需要進位?
(總和大於 10)
1
What is the type?
需不需要借位?
(總和大於 10)
2
Carry and borrow
3
End
直式計算~
Enjoy the joy of solving a math problem .w.
\(10=0+10\)
把兩數湊到 10 (ゝ∀･)b
\(=1+9\)
\(=2+8\)
\(=3+7\)
\(=4+6\)
\(=5+5\)
題外話: \(7+3=?\)
Commutative property (交換律)
\(10-0=10\)
In other words (ゝ∀･)b
\(10-1=9\)
\(10-2=8\)
\(10-3=7\)
\(10-4=6\)
\(10-5=5\)
If the sum of two nums is greater than 10?
How about more practice? (addition)
How about more practice? (subtraction)
直式計算
我不知道怎麼翻成英文 QAQ
When we calculate the sum or difference of two numbers, 直式計算 can help us carry and borrow when numbers are not "easy".
ex: One or Two of the numbers have two digits.
怎麼用直式加法? (無進位)
TIP：以直式計算時，不論如何皆須由低位數往高位數計算 :D (個位數至十位數)
Q: \(32+47=?\)
\(32\)
\(47\)
\(＋\)
\(79\)
怎麼用直式加法? (有進位)
Example 2
\(5+7=5+5+2=10+2\)
2
1
8
怎麼用直式減法? (無借位)
TIP：以直式計算時，不論如何皆須由低位數往高位數計算 :D (個位數至十位數)
Q: \(65-41=?\)
\(65\)
\(41\)
\(-\)
\(24\)
怎麼用直式減法? (有借位)
Q: \(75-46=?\)
\(75\)
\(46\)
\(-\)
\(29\)
What just happened?
\(15\)
\(7-1=6\)
Example
Q: \(92-38=?\)
\(75\)
\(46\)
\(-\)
\(54\)
妳如何借位 (Borrow) ?
Example
Practice makes perfect!
Q1:
\(8+3=8+2+1=10+1\)
1
7
1
\(28+43=71\)
Q2:
\(98-39=59\)
\(98\)
\(39\)
\(-\)
\(59\)
\(8+10=18\)
\(9-1=8\)
Jamboard time :p
抱歉，我沒有手寫筆，可能字會寫的很醜。
Sorry for my scrawled (adjective, 潦草的) handwriting.
Multiplication
New, but easy concept.
What is multiplication?
OMG!!!
What is a mutiplication table?
Division
Let's eat the cake together!
Definition (定義) of division
被除數
除數
商 (計算的結果)
Simply put, the process of division is to divide a group of items into equal but smaller groups
Q&A timeeee
Ask anything you haven't fully understood. :)
Game time?
Have a good time ^^
See ya!
Thx for your listening.
Addition & subtraction lesson
By 賴昱錡
Addition & subtraction lesson
家教用
