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Unit
Facilitator’s Guide G05 ~ Mathematics
Special properties of +, –, × and ÷ • • • • • • • • •
358 – 358 = 0 2 264 – 0 = 2 264 237 – 4 + 4 = 237 927 + 366 – 366 = 927 8 216 ÷ 8 216 = 1 635 × 1 = 635 2 147 ÷ 2 147 = 1 125 ÷ 25 × 25 = 125 65 × 4 ÷ 4 = 65
Write down 5 of your own examples.
Learners must give their own examples. Let them go through the thought process on their own. Try not to help them but guide them if they really need help and let them think of more examples on their own.
Now that you have given your own examples, have another look at the number sentences above. What do you notice? Complete the sentences:
1.
When you subtract a number from itself, the answer is 0.
3.
Division is when you divide a number into equal parts or groups.
5.
When you multiply or divide a number by 1, the answer is the same/unchanged.
2.
4. 6.
When you add a number and then subtract that same number, you get the number you started with.
When you divide a number by itself, the answer is 1.
When you multiply or divide a number by the same number, you get the number you started with.
Pairs of equivalent number sentences
The word ‘equivalent’ means something is equal to something else or has the same value as something else.
Equivalent means equal to
Next, you will ensure that two number sentences are equivalent and not merely a number sentence with an equivalent answer. Look at the examples below. Example 1 Number sentence 1: 356 + 133 © Optimi
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