Prerequisite Skills SKILL CHECK me: ______________ Date: ____________ r Math MC2 Ch 2 Decimals Name Date _hr Math source N a m e D a t e _ h r M a t h s o u r c e
Prerequisite Skills SKILL CHECK
Name: ______________ Date: ___________________ hr Math MC2 Ch 2
DecimalsName Date_hr Math source N
ame
Date
_hr Math
source
Prerequisite Skills SKILL CHECK
PLACE VALUE
Name: ______________ Date: ___________________ hr Math MC2 Ch 2 pgs 54-55
Decimals: Ordering, comparing, & rounding
Nam
eD
ate_hr M
athsource
ROUNDING:When Rounding:•0, 1, 2, 3, 4, stays the same•5, 6, 7, 8, 9 rounds up•Every empty place after where you rounded to becomes a ZERO
Prerequisite Skills SKILL CHECK
PLACE VALUE
Name: ______________ Date: ___________________ hr Math MC2 Ch 2 pgs 54-55
Decimals: Ordering, comparing, & rounding
Nam
eD
ate_hr M
athsource
Comparing:When Comparing:•1st list the numbers lining up the decimal points•2nd write ZEROS as place holders so that #s have the same # of digits•3rd then compare digits from left to right
Prerequisite Skills SKILL CHECK
Round the number to the place value of the red digit.
4. 845
ANSWER 850
5. 12,0.47
6. 739.022
739.000ANSWER
100.00ANSWER
7. 299.3438
300.0000ANSWER
Prerequisite Skills
Olympic Games
EXAMPLE 1 Comparing Decimals
To determine which race time given above is faster, compare 22.5 and 22.05.
In the 1968 Summer Olympics, Irena Szewinska of Poland won the women’s 200 meter dash with a time of 22.5 seconds. In 2004, Veronica Campbell of Jamaica won the event with a time of 22.05 seconds. Whose time is faster?
22.5022.05
The tens’ and ones’ digits are the same.
Write a zero as a placeholder.
The tenths’ digits are different. 5 > 0, so 22.50 > 22.05.
Prerequisite SkillsEXAMPLE 1
ANSWER
Because 22.5 > 22.05, Veronica Campbell’s time is faster.
Comparing Decimals
Prerequisite SkillsGUIDED PRACTICE for Example 1
Copy and complete the statement using <, >, or =.
1. 30.12 ? 30.4
ANSWER <
2. 7.7 ? 7.70
ANSWER =
3. 5.701 ? 5.699
ANSWER >
Prerequisite Skills
SOLUTION
EXAMPLE 2 Ordering Decimals
Order 2.11, 2.21, 2, 2.06, and 2.24 from least to greatest.
On a number line, mark tenths between 2.0 and 2.3. Mark hundredths by dividing each tenth into ten equal parts. Then graph each number.
From least to greatest, the numbers are 2, 2.06, 2.11, 2.21, and 2.24.
ANSWER
Prerequisite Skills
SOLUTION
EXAMPLE 3 Rounding a Decimal
Round 7.126 to the nearest tenth.
7.126
ANSWER
The decimal 7.126 rounded to the nearest tenth is 7.1.
Because the hundredths’ digit is less than 5, round down and drop the remaining digits.
You want to round to the nearest tenth.
Prerequisite SkillsGUIDED PRACTICE for Examples 2 and 3
Order the numbers from least to greatest.
4. 3.84, 4.4, 4.83, 3.48, 4.38
3.48, 3.84, 4.38, 4.4, 4.83ANSWER
5. 5.71, 5.8, 5.68, 5.79, 5.6
5.6, 5.68, 5.71, 5.79, 5.8ANSWER
Prerequisite SkillsGUIDED PRACTICE
Round the number to the nearest hundredth.6. 34.0152
34.02ANSWER
7. 1.5034
1.50ANSWER
8. 22.6654
22.67ANSWER
9. 125.7049
125.70ANSWER
for Examples 2 and 3
Prerequisite Skills VOCABULARY CHECK
Copy and complete using a review word from the list below.
dividend, divisor, quotientANSWER
ANSWER round
1. In the division equation 42 6 = 7, 42 is called the
? , 6 is called the ? , and 7 is called the ? .
2. If you ? 1723 to the nearest hundred, you get 1700.
digit number line less than greater thanround dividend divisor quotientestimate
Prerequisite Skills
ANSWER digit
3. The ? in the tens’ place of the number 637 is 3.
Copy and complete using a review word from the list below.
digit number line less than greater thanround dividend divisor quotientestimate
VOCABULARY CHECK
Prerequisite Skills
Estimate the sum or difference.
ANSWER 1900
13,987+ 32,053
9. 54,036
ANSWER 100,000
8. 905
782
+ 179
SKILL CHECK
Prerequisite Skills
Estimate the sum or difference.
10. 2874 – 1951
ANSWER 1000
11. 26,780 – 17,702
ANSWER 9000
SKILL CHECK