Using shortcut method to determine 892+99.
Step I - Let's split 99 into (100-1) to use shortcut method.
892+99 = 892+100-1 = 992-1
= 991
Hence, 892+99 = 991.
Estimate using general rule 640+892.
Using shortcut method to determine 334+9.
Using shortcut method to determine 9823-999.
Using shortcut method to determine 2300÷25.
Using shortcut method to determine 128000×625.