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Chapter 3Add and Subtract Decimals
Sequence An ordered list of numbers
Term Each of the numbers in a sequence
Benchmark A familiar number used as a point of reference
Estimate To find a number that is close to an exact amount
Round To replace a number with one that is simpler and is
approximately the same size as the original number
Hundredth One of one hundred equal parts
Tenth One of ten equal parts
Thousandth One of one thousand equal parts
Show Animated math Module for lesson 3-1
Standard Form
Word Form
Expanded Form
Then complete:Show What you Know
Vocabulary Builder
Lesson 3-1: Thousandths Date
Do after p. 105
Test Prep Lesson 3-1: Use your clicker to answer the following question:
Lesson 3-2: Place Value of Decimals Date
Test Prep Lesson 3-2: Use your clicker to answer the following question:
Lesson 3-3: Compare and Order Decimals Date
3 Ways to Compare and Order Decimals
1.Use decimal model (draw a picture)
1. Use a number line
3. Use place value (line decimals up vertically)
Watch animated math module
Test Prep Lesson 3-3: Use your clicker to answer the following question:
Lesson 3-4: Round Decimals Date
Unerline the digit in the place you want to round
Step 1
If the digit to the right of the underlined number is: less than 5 keep the underlined number the same greater than 5 round the underlined number up
Step 2
5 or more raise the score 4 or less let it rest
Drop the digits to the right of the underlined number
Step 3
Rounding Rules
Round 0 . 437 to nearest hunderedth
Round 0 . 437 to nearest tenth
Round 11 . 815 to nearest whole number
Round 14 . 603 to nearest hunderedth
Round 14 . 603 to nearest whole number
Round 4.6821 to the nearest:
Whole Number (One)
Tenths
Hunderedths
Thousandths
Test Prep Lesson 3-4: Use your clicker to answer the following question:
Lesson 3-5: Decimal Addition Date
Draw a quick picture to add decimals
Add 0.34 + 0.27 = _____
Add 2.5 + 2.8 = _____
Add 1.37 + 1.85 = _____
Test Prep Clicker Question Lesson 3-5:
Lesson 3-6: Decimal Subtraction with Base Ten Blocks
Date
0.84 – 0.56=
2.82 – 1. 47 =
3.17 – 0.2 =
Test Prep Clicker Question Lesson 3-6:
Lesson 3-7: Estimate Decimal Sum and Differences Date
Estimate using
Rounding Benchmarks
1.24 0.82+ 3.4
8.78 _ 0.30
5 or more raise the score 4 or less let it rest 10 0.25 0.50 0.75
6.17 _ 3.5
2.08 0.56+ 0.41
3.28 _ 0.86
Rounding vs. Benchmark
Test Prep Lesson 3-7: Use your clicker to answer the following question:
Lesson 3-8: Add Decimals Date
Step 1: Estimate
Step 2: Vertically line up the place values
Step 3: Add
52.7 + 0.36 =
Test Prep Lesson 3-8: Use your clicker to answer the following question:
Lesson 3-9: Subtract Decimals Date
Step 1: Estimate
Step 2: Vertically line up the place values
Step 3: Subtract
5.2 – 3.6 = 13.2 – 8.04 =
Test Prep Lesson 3-9: Use your clicker to answer the following question:
Lesson 3-10: Patterns with Decimals Date
Step 1: Look for a pattern is the sequence increasing or decreasing
Step 2: Write a rule that describes the sequence
Step 3: Extend the sequence to solve the problem
2.3, 3.5, 4.7, 5.9, __, __ Rule:
6.70, 5.60, 4.50, _____, 2.30, 1.20Rule:
Test Prep Clicker Question Lesson 3-10:
Lesson 3-11: Add and Subtract Money Date
Test Prep Lesson 3-11: Use your clicker to answer the following question:
Lesson 3-12: Choose a Method Date
N – 1.15 = 1.10
N + 1.55 = 1.91
14.21 + N + 15.88 = 31.88
Test Prep Lesson 3-12: Use your clicker to answer the following question: