Rounding to check answers Higher

Round any number up to 1,000,000 to the nearest 10, 100, 1,000,
10,000 and 100,000
Add and subtract numbers mentally with increasingly large numbers
Use rounding to check answers to calculations and determine, in the
context of a problem, levels of accuracy.
Children should be familiar with the word “approximate”, and
the degree of accuracy to which to round is a useful point for
discussion.
Generally, rounding to the nearest 100 for 3-digit numbers,
the nearest 1,000 for 4-digit numbers.

Ask,
“What place value column should we look at to round the
number to the nearest 10/100/1,000/10,000/100,000
“How could you use your estimates to check your answers?”
" Is the actual answer going to be greater or less than your
estimate? Why?”

One worksheet with answers attached.