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Unit 1 Overview
9L
09/29/08
Unit 1 Overview
9R
09/29/08
Comparing and
Ordering Decimals
Lesson 1.2
Page 6-7
Lesson 1.2:
pg. 7, # 5-16
09/29/08
09/29/08
Lesson 1.2:
Comparing & Ordering Decimals (pg. 6-7)
Standards:
10L
10R
CA Content Standards
• Number Sense 1.1: We compare and order
decimals.
• Mathematical Reasoning 1.0: We make
decisions about how to approach problems.
Lesson 1.2:
pg. 7, # 5-16
09/29/08
09/29/08
Lesson 1.2:
Comparing & Ordering Decimals (pg. 6-7)
Standards:
Vocabulary:
10L
10R
Review Vocabulary:
WHOLE NUMBER
• AKA: a counting number.
• One of the complete numbers (1, 2, 3, …) or
zero.
Review Vocabulary:
DECIMAL
• A symbol (.) used to demonstrate that a
number is a fraction or not complete.
• The opposite of a whole number.
• For example: 1.5, 8.77, 9.201
Lesson 1.2:
pg. 7, # 5-16
09/29/08
09/29/08
Lesson 1.2:
Comparing & Ordering Decimals (pg. 6-7)
Standards:
Vocabulary:
Objective:
10L
10R
Objective:
• Compare and order decimals.
• Math Link: You have learned how to compare
and order whole numbers. Now you will learn
how to compare and order decimals.
Lesson 1.2:
pg. 7, # 5-16
09/29/08
09/29/08
Lesson 1.2:
Comparing & Ordering Decimals (pg. 6-7)
Standards:
Vocabulary:
Objective:
Notes/ Examples:
10L
10R
Which number is greater:
0.357 or 0.359?
• Step 1: To compare decimals, start at the left and compare
digits in the same place.
• Step 2: If corresponding digits are the same, move on to the
right.
0.357
0.359
Step 3: Once you find
two corresponding
digits that are
different, the larger
one belongs to the
greater number.
Therefore,
0.357<0.359.
Which decimal is the greatest:
2.53 or 2.49?
• Step 1: To compare decimals, start at the left and compare
digits in the same place.
• Step 2: If corresponding digits are the same, move on to
the right.
2.53
2.49
• Step 3: Once you find two corresponding digits that are
different, the larger one belongs to the greater number.
• 2.53 > 2.49
Example 1.
Which decimal is the greatest:
0.347, 0.349, or 0.336?
• Step 1: To compare decimals, start at the left and compare
digits in the same place. If corresponding digits are the same,
move on to the right.
0.347
0.349
0.336
• Step 2: Once you find two corresponding digits that are
different, the larger one belongs to the greater number.
• 0.336 < 0.347 < 0.349
Example 2.
Which decimal is the greatest:
1.4357, 1.3475, or 1.4375?
• Step 1: To compare decimals, start at the left and compare
digits in the same place. If corresponding digits are the same,
move on to the right.
1.4357
1.3475
1.4375
• Step 2: Once you find two corresponding digits that are
different, the larger one belongs to the greater number.
• 1.3475 < 1.4357 < 1.4375
Example 3.
Which decimal is the greatest:
2.71, 2.6, or 2.65?
• Step 1: If decimals have different numbers of places, use equivalent decimals
in the comparison.
2.71 = 3 places
2.6 = 2 places
2.65 = 3 places
2.6  2.60 (3 places)
• Step 2: To compare decimals, start at the left and compare digits in the
same place. If corresponding digits are the same, move on to the right.
2.71
2.60
2.65
• Step 3: Once you find two corresponding digits that are different, the larger
one belongs to the greater number.
• 2.60 < 2.65 < 2.71
Example 4.
Lesson 1.2:
pg. 7, # 5-16
09/29/08
09/29/08
Lesson 1.2:
Comparing & Ordering Decimals (pg. 6-7)
Standards:
Vocabulary:
Objective:
Notes/ Examples:
Moral of the Story:
10L
10R
The Moral of the Story
• Comparing decimals is similar to comparing
whole numbers. Compare each place of each
number digit-by-digit.
Number Lines
• http://themathworksheetsite.com/numline.ht
ml
Math Minute # 2
11L
10/02/08
Math Minute # 2
11R
10/02/08
Math Minute # 2
①3  5 =
② Four dollars equal ___ pennies.
③2 + 5 x 2 =
④ 5 + 8 -3 =
⑤ 6/2 =
Math Minute # 2
Continued
⑥ 0, 4, 8, 12, ___, ___, ___
⑦ 0 x 5,132 =
⑧ 2 32
⑨ The product of four and three is ___.
⑩ The sum of five and four is ___.