🚀 4th Grade Math Playground 🚀
Large Numbers
12345678
千万: 1
百万: 2
十万: 3
万: 4
千: 5
百: 6
十: 7
个: 8
Multiplication
125
×
24
=
Division
840
÷
24
=
Parallelograms & Trapezoids
Click buttons to learn shapes!
Parallelogram Area
底: 10cm 高: 6cm
面积 =
cm²
Triangles
Click a triangle to learn about it!
Triangle Area
底: 12cm 高: 8cm
面积 =
cm²
Hint: Area = base × height ÷ 2
Decimals
3.50
= 3.5
0.8
= 8/10
Trailing zeros in decimals can be removed
Decimal Addition & Subtraction
12.5
+
8.3
=
Decimal Multiplication
2.5
×
4
=
Decimal Division
12.6
÷
3
=
Operation Laws
加法交换律: a + b = b + a
加法结合律: (a + b) + c = a + (b + c)
乘法交换律: a × b = b × a
乘法结合律: (a × b) × c = a × (b × c)
乘法分配律: (a + b) × c = a × c + b × c
25 × 4 × 8 = ?
Position & Direction
Click directions to learn angles!
Line Graphs
Click data points to see details!
Chicken & Rabbit
There are 8 chickens and rabbits in a cage with 22 legs total. How many chickens and rabbits are there?
🐔 鸡:
each
🐰 兔:
只
Tree Planting
Trees are planted every 10 meters along a 100-meter road (both ends included). How many trees are needed?
Answer:
trees
Word Problems
A car travels from City A to City B at 60 km/h and arrives after 3.5 hours. What is the distance between the two cities?
答案：
km