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: