Did you know an icosahedron has 20 faces, each an equilateral triangle? Ever wondered how your students could use an icosahedron to practise事实家庭? These awesome new Mathematics resources are a great, hands-on fact family activity for middle years primary students who are learning about the relationships between groups of three numbers.
What is a Fact Family?
Fact families are groups of three numbers that are related to each other and can create four different number sentences.
加法和减法事实家庭
Some fact families can create two addition number sentences and two subtraction number sentences.
例如，数字3、4和7形成一个事实家族，可以用以下数字句子表示：
3 + 4 = 7
4 + 3 = 7
7 – 3 = 4
7 – 4 = 3
Check out our editable加法和减法事实家庭微软幻灯片软件for more to help you teach this concept to your students.
Multiplication and Division Fact Families
一些事实家族可以创建两个乘法号句子和两个分区编号句子。
例如，数字3、12和36形成了事实家族，可以用以下数字句子表示：
3 x 12 = 36
12 x 3 = 36
36÷12 = 3
36 ÷ 3 = 12
We have a great, editable乘法和部门事实家族PowerPoint也！
动手事实家庭活动
Download these awesome fact family icosahedron resources for your students to use when practising fact family number sentences.
- Provide each student with an icosahedron template and a worksheet.
- 学生切出网，沿线折叠，然后将标签粘合以形成自己的二十面体。
- 学生将Icosahedron滚动到一个事实家族中，并在空白答案页面上的相应号码下完成两个乘法和两个划分句子。
- The red icosahedron contains fact families from the2、5和10乘法和划分事实.
- The blue icosahedron contains fact families from the3, 6 and 9 multiplication and division facts.
- 绿色二十面体包含来自4、7和12乘法划分事实.
Each of these resources can be downloaded in colour or black and white by selecting your preferred option from the drop-down menu beside the green “download” button.
If you and your students love hands-on activities as alternatives to traditional worksheets, you might like to check out these other awesome事实家庭resources:
