Round to check answers Core

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.