Without actual calculation, estimate:
447÷31
The estimate 447 is nearest to a tens =450
The estimate 31 is nearest to a hundred =30
∴447÷31=450÷30=15
Hence, the estimate calculation for the given expression is 15.
Without actual calculation find the value of 31 square minus 30 square
Without actually calculating find which is greater
3111 or 1714
How to find the square of 31 without actual multiplication?