Final answer:
To round to estimate products, round each number in the multiplication question and then perform the multiplication.
Step-by-step explanation:
To round to estimate products, we will use the rounding rule that if the digit being dropped is 5 or greater, we round up; if it is less than 5, we round down. Let's apply this rule to the given examples:
a. 3 x 287 = ?
Rounded, 287 becomes 300 and 3 x 300 = 900.
b. 6 x 1,310 = ?
Rounded, 1,310 becomes 1,300 and 6 x 1,300 = 7,800.
c. 5,1000 more Round 287 to Round 1,310 to Round 6
Rounded, 5,000 becomes 5,100 and 3 x 6 x 5,100 = 91,800.