Question

One way to estimate an answer is to __the numbers and then do the calculation

Answer 1

One way to estimate an answer is to round the numbers and then do the calculation

Answer 2

You round up or down the number. And then calculate. Anything that ends with 0,1,2,3,4 round down. Anything 5-9 round up. Example 43 + 47 would round to 40+50.