Question

lets estimate $675 - 518$.
(a) round each number to the nearest hundred.
$675$ rounds to $square$
$518$ rounds to $square$
(b) subtract the rounded numbers.
$square$

Explanation:

Step1: Round 675 to nearest hundred

Look at tens digit (7 ≥ 5), so round up: $675
ightarrow 700$

Step2: Round 518 to nearest hundred

Look at tens digit (1 < 5), so round down: $518
ightarrow 500$

Step3: Subtract rounded numbers

Calculate difference of rounded values: $700 - 500 = 200$

Answer:

(a) 675 rounds to 700; 518 rounds to 500
(b) 200