Question

estimate the sum 249+396​

Answer 1

Step-by-step explanation:

sum of 249 n 396= 645

by estimation no. will be 600

Answer 2

Answer:

sum of 249 n 396= 645

by estimation no. will be 600

Step-by-step explanation:

STEP 1: We round the summands to the nearest tenth. Remember:

If the number ends in 0, 1, 2, 3 or 4, we round down

If the number ends in 5, 6, 7, 8 or 9, we round up estimate

STEP 2: We add the rounded numbers

STEP 3: We look at the total amount of rounding. three things can happen:

If we’ve rounded one amount up and one down, the sum we have obtained is a correct estimation.

If both summands have been rounded up and the amount of rounding is greater than 5, we subtract 10 from the estimate.

If both summands have been rounded down and the amount of rounding is greater than 5, we add 10 to the estimate.

Let’s look at an example for each of these three cases: