Did you know an icosahedron has 20 faces, each an equilateral triangle? Ever wondered how your students could use an icosahedron to practise fact families? 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.
Addition and Subtraction Fact Families
Some fact families can create two addition number sentences and two subtraction number sentences.
For example, the numbers 3, 4 and 7 form a fact family and can be represented by the following number sentences:
3 + 4 = 7
4 + 3 = 7
7 – 3 = 4
7 – 4 = 3
Check out our editable Addition and Subtraction Fact Families PowerPoint for more to help you teach this concept to your students.
Multiplication and Division Fact Families
Some fact families can create two multiplication number sentences and two division number sentences.
For example, the numbers 3, 12 and 36 form a fact family and can be represented by the following number sentences:
3 x 12 = 36
12 x 3 = 36
36 ÷ 12 = 3
36 ÷ 3 = 12
We have a great, editable Multiplication and Division Fact Families PowerPoint too!
Hands-On Fact Family Activities
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.
- Students cut out the net, fold along the lines and glue the tabs to form their own icosahedron.
- Students roll the icosahedron to land on one fact family and complete the two multiplication and two division number sentences underneath the corresponding number on the blank answer page.
- The red icosahedron contains fact families from the 2, 5 and 10 multiplication and division facts.
- The blue icosahedron contains fact families from the 3, 6 and 9 multiplication and division facts.
- The green icosahedron contains fact families from the 4, 7 and 12 multiplication division facts.
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 fact families resources: