There were 8 birds sitting on a tree. 1 bird flew away. Which of the following equations can be used to find out the number of birds remaining on the tree?
A
1+9=8
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B
8+1=9
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C
8–1=7
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D
9–8=1
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Solution
The correct option is C8–1=7 Total number of birds =8
Number of birds that flew away =1
Number of remaining birds =8–1
On a number frame, if we place 8 counters first and remove 1 later, the counters left will be 7. 8–1=7
Hence, Option A is correct, and there are 7 birds remaining on the tree.