The check using addition, the value of difference is added to the smaller value which should give the larger wingspan value.
The value of the wingspan of the butterflies aren't given, however, we could take hypothetical values for the wingspan of the two butterflies :
Wingspan of Butterfly A = 5.55 cm
Wingspan of Butterfly B = 4 cm
This means that, the difference in the wingspan is :
Wingspan of A - Wingspan of B
5.55 cm - 4 cm = 1.55cm
To check using addition :
The value of the difference added to the value of the butterfly with the lower wingspan should give the value of the wingspan of butterfly B(larger wingspan).
This means:
4cm + 1.55cm = 5.55 cm
Hence, the value of the difference is correct.
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