Question

Write the rule to explain this given pattern.
84 + 9 = 84 + 10-1 =94-1=93
I
84 + 99 = 84 +100-1 = 184-1 = 183
84 + 999 = 84 +1000 -1 = 1084-1 = 1083
pls answer pls​

Answer 1

Answer:

factorisation

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Answer 2

Completing 10’s 100’s etc
Complementary numbers