2.4.2 Self-Check on Rounding
Exercise 3: Rounding Decimal
Numbers
Round each number to the specified placeholder:
(a) 456.28377 to the nearest thousandth.
Answer
(a) 456.284 (7 in the ten thousandths place indicates we round up).
(b) 2885 to the nearest hundred.
Answer
(b) 2900 (8 in the tens place indicates we round up).
(c) 43.653 to the nearest unit.
Answer
(c) 44 (6 in the tenths place indicates we round up).
(d) 752.245 to the nearest tenth.
Answer
(d) 752.2 (the 4 in the hundredths place indicates we leave the digit in the tenths place unchanged).
(e) 10.995 to 1 decimal place.
Answer
(e) 11.0 (the 9 in the second decimal place indicates that we round up 9 to 10).
(f) 15.5435 to 3 decimal places.
Answer
(f) 15.544 (the 5 in the fourth decimal place indicates that we up to 3 to 4).
(g) There is an advert in your local newspaper for a used car. The advertised price is $10,649. Estimate the price to the nearest $100 and $1000.
Answer
$10,600 (to the nearest $100).
$11,000 (to the nearest $1000).
2.4.1 Self-Check on Using a Number Line