Example 1 : 42*42
Step 1 : Here the base number we have to consider is 50
Step 2 : 50 – 42 = 8
Step 3 : The last two digits = 8*8 = 64
Step 4 : The first two digits = 25 – 8 = 17
Step 6 : 1764 (It’s the final answer)
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