In this activity, we will work out missing numbers in calculations.
Example 1
Find the missing number.
26 + ? = 50
Here, it is easy to work out the inverse.
50 - 26 = 24
Example 2
-26 + ? = 50
Here, we use the inverse again, but be careful about the negative sign.
Two negatives next to each other means a positive.
50 - -26 = 50 + 26 = 76
In this activity, we will be using inverse operations to find the missing numbers.
View the activity introduction for more information on the topic
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Question
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Teacher explanation