Arthmetic

​Arthmetic/ Số học

Some text here about the topic of discussion

​Numbers 0 - 10000/ Số từ 0 - 10000

​One digit numbers

​Are numbers from 0 to 9

​Two digit numbers

​Are numbers from 10 to 99

​81 - eighty one

​Three digit numbers

​Are numbers from 100 to 999

​681 - six hundred and eighty one

​Four digit numbers

​Are numbers from 1000 to 9999

​5681 - five thousand six hundred and eighty one

​Number 10000

​10000 - ten thousand

​Addition/Phép cộng

​5 + 4 = ?

​Answer : 9

​10 = 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5

​7 + 5

​3

​2

​Step 1 : 7 + 3 = 10

Step 2 : 10 + 2 = 12​

​Answer : 12

​2681 + 1111

​ 2681

+ 1111​

​Step 1 : 1 + 1 = 2

Step 2 : 8 + 1 = 9

Step 3 : 6 + 1 = 7

Step 4 : 2 + 1 = 3​

​3792

​2681 + 1911

​ 2681

+ 1911​

​Step 1 : 1 + 1 = 2

Step 2 : 8 + 1 = 9

Step 3 : 6 + 9 = 15, regroup 1 to thousands

Step 4 : 2 + 1 + 1 = 4​

​4592

​1

​Subtraction/Phép trừ

​8 - 7

​Answer : 1

​12 - 5

​2

​3

​Step 1 : 12 - 2 = 10

Step 2 : 10 - 3 = 7

​Answer : 7

​2681 - 1111

​ 2681

- 1111​

​Step 1 : 1 - 1 = 0

Step 2 : 8 - 1 = 7

Step 3 : 6 - 1 = 5

Step 4 : 2 - 1 = 1​

​1570

​2681 - 1911

​ 2681

+ 1911​

​Step 1 : 1 - 1 = 0

Step 2 : 8 - 1 = 7

Step 3 : 16 - 9 = 7, regroup 1 to thousands

Step 4 : 2 - 1 - 1 = 0​

​770

​1

​Multiplication/Phép nhân

​3 x 3 = 3 + 3 + 3 = 9

​ 2114

x 3​

​Step 1 : 3 x 4 = 12

Step 2 : 3 x 1 + 1 = 4

Step 3 : 3 x 1 = 3

Step 4 : 3 x 2 = 6​

​6342

​Division/Phép chia

​6 ÷ 2

​6

​2

​3

​Step 1 : 6 ÷ 2 = 3

Step 2 : 3 x 2 = 6

Step 3 : 6 - 6 = 0​

​6

​0

​7 ÷ 2

​7

​2

​3

​Step 1 : 7 ÷ 2 = 3

Step 2 : 3 x 2 = 6

Step 3 : 7 - 6 = 1

​6

​1

​6766 ÷ 2

​6766

​2

​3383

​Step 1 : 6 ÷ 2 = 3

Step 2 : 3 x 2 = 6(0)

Step 3 : 67 - 60 = 07

Step 4 : 7 ÷​ 2 = 3

Step 5 : 3 x 2 = 6​

Step 6 : 7 - 6 = 1, copy down tens

​Step 7 : 16 ÷ 2 = 8

Step 8 : 8 x 2 ​= 16

Step 9 : 16 - 16 = 0​, copy down units

Step 10 ​: 6 ÷ 2 = 3

Step 11 : 3 x 2 = 6​

Step 12 : 6 - 6 = 0​

​60

​7

​6

​16

​16

​06

​6

​0