Transcript Prerequisite Skills SKILL CHECK

Prerequisite Skills
SKILL CHECK
Name: ______________
____ hr Math
Date: _______________
MC2 Ch 2
Decimals
Date
source
Name
_hr Math
Name
_hr Math
Date
source
Prerequisite Skills
SKILL CHECK
ROUNDING:
Date
source
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
Name
_hr Math
Name: ______________
Date: _______________
____ hr Math
MC2 Ch 2 pgs 54-55
Decimals: Ordering, comparing, & rounding
PLACE VALUE
Prerequisite Skills
SKILL CHECK
Comparing:
Date
source
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
Name
_hr Math
Name: ______________
Date: _______________
____ hr Math
MC2 Ch 2 pgs 54-55
Decimals: Ordering, comparing, & rounding
PLACE VALUE
Prerequisite Skills
SKILL CHECK
Round the number to the place value of the red digit.
4.
845
ANSWER
5.
12,0.47
ANSWER
6.
850
100.00
739.022
ANSWER
739.000
7. 299.3438
ANSWER
300.0000
EXAMPLE
Prerequisite
1 Skills
Comparing Decimals
Olympic Games
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?
To determine which race time given above is faster,
compare 22.5 and 22.05.
22.50
22.05
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.
EXAMPLE
Prerequisite
1 Skills
Comparing Decimals
ANSWER
Because 22.5 > 22.05, Veronica Campbell’s time is faster.
Prerequisite
Skills
GUIDED
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
>
EXAMPLE
Prerequisite
2 Skills
Ordering Decimals
Order 2.11, 2.21, 2, 2.06, and 2.24 from least to greatest.
SOLUTION
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.
ANSWER
From least to greatest, the numbers are 2, 2.06, 2.11,
2.21, and 2.24.
EXAMPLE
Prerequisite
3 Skills
Rounding a Decimal
Round 7.126 to the nearest tenth.
SOLUTION
You want to round to the nearest tenth.
7.126
Because the hundredths’ digit is
less than 5, round down and drop
the remaining digits.
ANSWER
The decimal 7.126 rounded to the nearest tenth is 7.1.
Prerequisite
Skills
GUIDED
PRACTICE
for Examples 2 and 3
Order the numbers from least to greatest.
4.
3.84, 4.4, 4.83, 3.48, 4.38
ANSWER
5.
3.48, 3.84, 4.38, 4.4, 4.83
5.71, 5.8, 5.68, 5.79, 5.6
ANSWER
5.6, 5.68, 5.71, 5.79, 5.8
Prerequisite
Skills
GUIDED
PRACTICE
for Examples 2 and 3
Round the number to the nearest hundredth.
6. 34.0152
ANSWER
7.
1.5034
ANSWER
8.
1.50
22.6654
ANSWER
9.
34.02
22.67
125.7049
ANSWER
125.70
Prerequisite Skills
VOCABULARY CHECK
Copy and complete using a review word from
the list below.
digit
round
estimate
number line
dividend
less than
divisor
greater than
quotient
1. In the division equation 42 6 = 7, 42 is called the
? , 6 is called the ? , and 7 is called the ? .
ANSWER
dividend, divisor, quotient
2. If you ? 1723 to the nearest hundred, you get 1700.
ANSWER
round
Prerequisite Skills
VOCABULARY CHECK
Copy and complete using a review word from
the list below.
digit
round
estimate
number line
dividend
less than
divisor
greater than
quotient
3. The ? in the tens’ place of the number 637 is 3.
ANSWER
digit
Prerequisite Skills
SKILL CHECK
Estimate the sum or difference.
8.
905
782
+ 179
ANSWER
9.
1900
54,036
13,987
+ 32,053
ANSWER
100,000
Prerequisite Skills
SKILL CHECK
Estimate the sum or difference.
10.
2874
– 1951
ANSWER
11.
1000
26,780
– 17,702
ANSWER
9000
Prerequisite Skills
Evaluate the expression.
12. 14 + 6 7
ANSWER
13.
56
12
2+4
ANSWER
14.
2
10
4 + 52
ANSWER
15.
5– 2
ANSWER
33
2
1
SKILL CHECK