Using shortcut method to determine 87233-9999.
Step I - Let's split 9999 into (10000-1) to use shortcut method.
87233-9999 = 87233-10000+1 = 77233+1
= 77234
Hence, 87233-9999 = 77234.
Using shortcut method to determine 9823-999.
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Using shortcut method to determine 892+99.
Using shortcut method to determine 2300÷25.
Using shortcut method to determine 128000×625.