Drawing models is one of the most fundamental skills learnt in Primary School Math.
It is used to:
1. Make a comparison across 2 or more groups. (‘Units and Difference’) 2. Find a value of a group given total or find the total given groups. (‘Part and Whole’ - explored in this post)
'Whole' represents the total (use addition to find)
'Part' represents the groups (use subtraction to find)
There are 2 'Parts' and 1 'Whole' here.
Let's take a look at an example of a Primary 3 question.
A baker sold a total of 548 chocolate and vanilla cupcakes. 239 of the cupcakes sold were vanilla cupcakes. How many chocolate cupcakes were sold?
Total ('Whole') → 548
Vanilla ('Part') → 239
Chocolate ('Part') → 548 - 239 = 309
At UNBOXED, we cultivate a habit in our students to label their models properly, i.e names, values and the keyword as ‘?’ to focus their attention on what the question is asking for.
In the next blog post, we will explore the model framework for ‘Units and Difference’.
Meanwhile, here’s a sample of our Primary 2 ‘Part and Whole’ worksheet (main section only, with answers provided) available for FREE download!
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