Number (mult/div)
Hong Kong
Stage 2
Use rounding to estimate solutions
Interactive practice questions
Let’s estimate the solution to $24\times24$24×24 by rounding the digits first.
a
Rewrite the calculation but use rounded numbers to the nearest $10$10.
$\editable{}\times\editable{}$×
b
Calculate $20\times20$20×20.
c
Is $400$400 going to be larger or smaller than the actual result of $24\times24$24×24?
Smaller
A
Larger
B
Easy
1min
Let’s estimate the solution to $28\times38$28×38 by rounding the digits first.
Easy
1min
Let’s estimate the solution to $87\times22$87×22 by rounding the digits first.
Easy
< 1min
Let’s estimate the solution to $224\times73$224×73 by rounding the digits first.
Easy
2min
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