epdf.pub_cbest-cliffs-test-prep13a9b242c7cb4125e6cca92d00a73d5a41681

Arithmetic
Estimating Sums, Differences,
Products, and Quotients
Estimating Sums
Use rounded numbers to estimate sums. For example:
Give an estimate for the sum 3, 741 + 5,
021 rounded to the nearest thousand.
3, 741 + 5,
021
↓ ↓
4, 000 + 5, 000 = 9,
000
So 3, 741 + 5, 021 . 9,
000
(The symbol ≈ means is approximately equal to.)
Estimating Differences
Use rounded numbers to estimate differences. For example:
Give an estimate for the difference 317, 753 - 115,
522 rounded to the nearest
hundred thousand.
317, 753 - 115,
522
↓ ↓
300, 000 - 100, 000 = 200,
000
So, 317, 753 - 115, 522 . 200,
000
Estimating Products
Use rounded numbers to estimate products. For example:
Estimate the product of 722 # 489 by rounding to the nearest hundred.
722 # 489
↓ ↓
700 # 500 = 350,
000
So 722 # 489 . 350,
000
197