UNIT 5 REVIEW

Everyday Math

Grade 4

BES

Get your whiteboard ready!

We’ll go lesson by lesson to review the concepts you learned throughout the unit.

Ready, set… Thinking cap on? Go!!!

Lesson 5.1-X Fact Extensions

80 x 40 = 3,200

30 x 700 = 21,000

50 x _____ = 250 5

_____ x 90 = 54,000 600

Skill: Extend basic facts to products of ones and tens and products of tens and tens

Strategy: Ignore the zeros, multiply the remaining basic factors, count up the zeros and add them onto your product

Lesson 5.2-Multiplication Wrestling

Purpose: to provide practice with extended multiplication facts and to introduce the principles of multi-digit multiplication

Let’s move right along!

Lesson 5.3-Estimating Sums 868 + 423 =

900 + 400 = 1,300

591 + 632 + 372 = 600 + 600 + 400

1,600 287 + 1,793 + 2,552 =

300 + 2,000 + 3,000 5,300

17,922 + 4,008 + 5,827 = 18,000 + 4,000 + 6,000

28,000

Purpose: to provide practice estimating sums

Strategy: the larger the place value you round to, the easier it is to estimate in your head

So remember, keep it simple!

Lesson 5.4-Estimating Products

Purpose: to practice estimating whether a product is in the tens, hundreds, thousands, or more

Strategy: similar to addition, once numbers are rounded, multiply (ignore the zeros, then add them to the product)

49 x 22 = 50 x 20 =

1,000 (thousands) 97 x 73 =

100 x 70 7,000 (thousands)

190 x 68 = 200 x 70

14,000 (ten-thousands)

4,847 x 411 = 5,000 x 400 =

2,000,000 (millions)

Lesson 5.5 and 5.6-Partial-Products and Traditional

Purpose: to review and practice the partial-products algorithm and the traditional method

Remember: pay close attention to place values (values of digits)

Let’s practice!

73 x 9 =

657

45 x 81 =

3,645

Lesson 5.8-BIG Numbers

Part I: Reading 356,092 92,837,006 3,872,093,576

Part II: Writing Listen carefully as your

teacher reads aloud some BIG numbers. Record them on your whiteboard.

Lesson 5.9-Powers of 10

Purpose: to introduce exponential notation for powers of 10

Exponents help us name the values of places in our base-ten system.

Let’s review! (No whiteboards

needed.)

1 = 100

Let’s build on that piece of information!

10 = 101 = 10 100 = 102 = 10 x 10 1,000 = 103 = 10 x 10 x10 10,000 = 104

10 x 10 x 10 x 10 100,000 = 105

10 x 10 x 10 x 10 x 10 1,000,000 = 106

10x10x10x10x10x10

Lesson 5.10-Rounding LARGE Numbers

Purpose: to discuss sensible ways to report large numbers and to review rounding a number to a certain place value

Strategy: underline the given place value, look to place value to the right, 0-4 stay, 5-9 round up

Let’s practice!

Round to the nearest thousand

18,219 18,000

Round to the nearest hundred-thousand

3,478,398 3,500,000

Round to the nearest million 673,908,004 674,000,000

Lesson 5.11-Comparing Data

Purpose: to look up and compare numerical data

Strategy: line up the place values in each number, starting on the left look for the larger digit

Let’s practice!

Get into groups of three. Two of you need to need to

write numbers in the hundred-thousands.

The third person needs to write <, >, or = to complete each sentence.

Finally, turn and face the teacher to have your work checked.

Round 2: ten-millions Round 3: billions

Lesson 5.12-Checking Progress

Purpose: to assess your progress on math content through the end of Unit 5.

That means, other skills, such as measuring and computation involving decimals, will be tested as well.

Good luck!