In this activity, we will be finding the missing number to make the total of 1,000.
Example
Find the number that makes the calculation correct.
380 + __ = 1,000
Answer
The opposite (inverse) of adding is subtracting.
So we work out 1,000 - 380
We can do this in stages 1,000 - 300 = 700
700 - 80 = 620
Does that make sense?
Let's practise this in the following questions.
View the activity introduction for more information on the topic
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Question
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Teacher explanation