Question

Give a rough estimate (by rounding off to the nearest hundreds) and also a closer estimate
(by rounding off to the nearest tens) for the following: with full method
a. 215 + 395 +4,776
b. 468 + 1,239 +5,694
c. 9,543 - 729
d. 86,786 -74,834​

Answer 1

Step-by-step explanation:

(a) 215 + 395 + 4,776 = 5,386

Rounding off nearest hundreds of 5,386 = 5,400

Roinding off nearst tens of 5,386 = 5,390

(b) 468 + 1,239 + 5,694 = 7,401

Rounding off nearest hundreds of 7,401 = 7,400

Rounding off nearest tens of 7,401 = 7,400

(c) 9,543 - 729 = 8,814

Rounding off nearest hundreds of 8,814 = 8,800

Rounding off nearest tens of 8,814 = 8,810

(d) 86,786 - 74,834 = 11,952

Rounding off nearest hundreds of 11,952 = 12,000

Rounding off nearest tens of 11,952 = 11,950